When Katherine Acosta, who lives in Houston, was prescribed bed rest after a miscarriage in 2017, she started watching “Game of Thrones” for the first time. Within a week, she had seen all seven seasons. Then, she watched all of the episodes twice more.

So when she became pregnant again that year, Ms. Acosta knew exactly the name her daughter would have: Khaleesi, which essentially means “queen” in the made-up language Dothraki. It is also one of the many titles held by Daenerys Targaryen, a main character on the show and one of the contenders for the Iron Throne.

“Her character loses the baby and then she gets stronger again,” Ms. Acosta said. “She defeats all the odds. She knows what she wants.”