Some names seem to have been around forever, and yet seem perfectly contemporary to name your child even today. Think James for boys or Mary for girls, which have seen high levels of use since the beginning of record-keeping. Other names, however, are just evocative of a specific era and can sometimes give strong clues to the person’s year of birth. Girls named Linda were most likely born in 1947, while odds are good that the average kindergarten boy you run into these days will have a name that ends in n.

Calculating the names that are most popular in a year or years is fairly straightforward, and can be done by looking at the Social Security Administration’s baby name database. However, if you want to find out the girls and boys names that are most distinctive to an era, looking at the absolute most popular names will not be enough to reveal those really generation-specific names like Maude or Elmer. To do this, I developed a measure of generational distinctiveness. This is calculated by dividing how often a name appears per sex within a generation (as defined within the Strauss-Howe generational theory) and dividing how often it appears per sex throughout the entire period from 1883 to 2015. The higher the score, the more generationally distinctive a name is. Below are the top three most distinctive girls and boys names of every generation based on this measure.

1. LOST GENERATION // 1883-1900

Girls: Maude, Effie, Minnie

Boys: Will, Harry, Charlie

Members of this generation were defined by coming of age during World War I and the 1920s. Gertrude Stein used the term in a conversation with Ernest Hemingway (“you are all a lost generation”). It was originally used to describe Hemingway and other writers of that era including F. Scott Fitzgerald and ee cummings.

The popularity of Maude is usually attributed to the 1855 poem "Maud" by Alfred Lord Tennyson. Effie, a diminutive for Euphemia, was likely inspired by Effie Gray, who was at the center of a publicized Victorian love triangle. Minnie (short for Wilhelmina) was more popular still in the 1880s, but stayed in use for longer, making it less distinctive to the Lost Generation. The most Shakespearean of names—William—was the #2 name for boys until 1909. However, its shortened form of Will was most unique to the Lost Generation. Harry peaked in 1889 at #8 for boys and had a steady but not rapid decline in subsequent decades. Charlie similarly piggy-backed off Charles, which was the #5 name for boys but stuck around for longer than the diminutive form.

2. G.I. GENERATION // 1901-1924

Girls: Gertrude, Mildred, Viola

Boys: Elmer, Chester, Clarence

Members of this generation came of age during the Great Depression and World War II.

Gertrude is the quintessential late 1800s/early 1900s girls name, used both in popular fiction and by well-known socialites. Mildred was the more popular overall, staying at #6 from 1912 to 1920, but remained in use for longer after the end of the generation than Gertrude did. Also from literature (specifically Shakespeare’s Twelfth Night), Viola was big in the early 1900s before sharply retreating. Looney Tunes character Elmer Fudd premiered in 1940, and odds are he’d be in his 40s by then if he was real, as the name peaked in the late 1800s but kept being given to boys into the early 1900s. Chester stayed in the top 50 most popular boys names throughout the 20th century’s first two decades, likely buoyed by the presidency of Chester A. Arthur. Clarence peaked in 1901 at #17 for boys and stayed in the top 30 for the whole generation, so was more popular than Elmer or Chester but didn’t decline as rapidly in subsequent decades.

3. SILENT GENERATION // 1925-1942

Girls: Dolores, Betty, Joan

Boys: Gene, Billy, Norman

Members of this generation are defined by the post World War II McCarthyist period. "Silent" is a reference to “working within the system” and not wanting to disturb the social order. The term was coined in a TIME magazine essay in 1951.

Few American-born girls are named Dolores today, but in the 1920s, the name became synonymous with beauty and glamor, first with model Kathleen Rose (stage name Dolores) and then with Mexican actress Dolores del Río. Like Dolores, Betty also peaked in 1930 but was much more popular overall that year at #2. However, Betty stuck around longer, making it less distinctive to the era. Joan peaked in 1932, likely driven by the success of actress Joan Crawford. Gene (short for Eugene) never truly broke out but was consistently around #70 for boys names for the entire generation. Billy did break out in 1930 likely due to the release of film Billy the Kid. Child actor Norman Chaney’s short movie career peaked around the time that the name Norman reached the height of its popularity.

4. BABY BOOMERS // 1943-1960

Girls: Linda, Judy, Gail

Boys: Gary, Larry, Dennis

Members of this generation were born in the “baby boom” years when the U.S. birth rate grew rapidly after World War II.

Inspired by a Buddy Clark song of the same name, Linda may well be the trendiest baby name of all time, and it was an immensely popular girls name for Baby Boomers. Judy—a diminutive of Judith—peaked and dipped around the same time as Linda, but was not as popular overall. Gail, short for Abigail, peaked in 1951. For boys, Gary peaked at #9 in 1954 after a decade or so of Oscar wins by actor Gary Cooper. Larry and Dennis attained their maximum popularity a few years prior to that.

5. GENERATION X // 1961-1981

Girls: Tammy, Tracy, Tonya

Boys: Todd, Scott, Chad

Members of this generation get their name from the 1991 novel Generation X: Tales for an Accelerated Culture by Douglas Coupland. A Pew Research report refers to Generation X as "America’s neglected 'middle child'" due to its position between the much larger Baby Boomer and Millennial generations.

Todd and Scott are two of the earliest popular examples of the use of what were once exclusively last names as first names. Chad peaked in 1972 as the #25 most popular boy name, and the vast majority of Chads were born during Generation X. Likewise with girls named Tammy, Tracy, and Tonya.

6. MILLENNIALS (GENERATION Y) // 1982-2004

Girls: Brittany, Kelsea, Chelsea

Boys: Cody, Zachary, Kyle

Members of this generation are often the children of Baby Boomers, and have overtaken them as the largest population group. The name was popularized by the book Millennials Rising: The Next Great Generation by Neil Howe.

Babynamewizard’s Laura Wattenberg has pointed out that we have seen an increase in alternate spellings of names, but not necessarily an increase in names in recent years. Kelsea and Chelsea are examples of this. Brittany peaked as the third most popular girl’s name in 1989, and just about all the Brittanys are Millennials. Cody and Kyle are also first names that were originally last names. Zachary peaked as 12th most popular boy’s name in 1994 and probably owes its increased popularity to celebrities Robin Williams and John Denver, who picked this name for their kids starting in the early 1980s.

7. HOMELAND GENERATION (GENERATION Z) // 2005-present

Girls: Addison, Nevaeh, Zoey

Boys: Ayden, Aiden, Jayden

Babies being born today would be counted as members of this generation. “Homeland” was picked as the name for the post-Millennial generation in a website contest hosted by Neil Howe. The term is in reference to the post-9/11 American political climate.

Robbie Gonzalez at io9 called the habit of ending boys names in n “one of the weirdest naming trends in American history," and names that rhyme with Aidan are a popular subset of these. This is evidenced by the top three boys names. Nevaeh is the word heaven spelled backwards and was popularized by musician Sonny Sandoval naming his daughter that in 2000. Zoey is a phonetic variant of the Greek name Zoe, which was popularized through use in several TV shows. Addison’s popularity stems from its rhyming with Madison, which became popular as a girl’s name after the movie Splash featured a mermaid that picked it as her own. It also continues the trend of last names becoming first names. In a nod to the Lost Generation, Madison’s original male meaning is “son of Maud.”

Source and Methodology: The source is the Social Security Administration’s baby names database and includes births through 2015 (most recent available). For this analysis, no births before 1883 were included. Name totals were grouped by sex for all names (two groups), as well as by sex within each of the seven most recent Strauss-Howe generations (14 sub-groups). These totals were then used to calculate the total incidence within each sex as well as the incidence within each sex by generation. Generational distinctiveness was calculated by dividing incidence by sex and generation by total incidence by sex. To ensure a level of relative popularity, the minimum threshold for a name’s inclusion in a sub-group is that it has to comprise at least .25 percent of total births within that sub-group.