The meaning I found was "One who helps God" but "Prince of God" also very much fits Asriel's character as he's the prince of the underground.

While Asriel is one name of the Angel of Death, they also have been known specifically two other names: Azazael and Samael which can be thought of as separate entities entirely, not one but 3 angels.

This could relate to the meaning of the Delta Rune which Gerson explains tells of a prophecy that an angel who has seen the surface would either break the barrier and free all monsters, or kill all monsters.

The Delta Rune has a circle between a pair of wings probably representing angel wings and a halo over 3 triangles...perhaps it does not mean 1 angel but 3 angels! Asriel, Frisk, and Chara.

Frisk and Chara both came from the surface and with Chara, Asriel saw the surface, then as Flowey, Asriel played through many timelines and killed everyone (Except for Sans who always beat him and costed him many resets). Then Frisk came along and usurped Flowey's powers to save and reset the timeline and depending on what you as the anomaly chooses Frisk could be the savior or the destroyer of the underground. This is important to the other two names I brought up before Azazael and Samael. Frisk could be connected to Samael who's seen as both good and evil, also known as the Destroyer and Seducer and we all know Frisk loves flirting! As for Chara, I think they would connect to Azazael who's also known as the Scapegoat, and the majority of undertale community has scapegoated Chara as the true villain of Undertale while really Chara's calling you out on how disgusting you as the player are for killing everything and destroying the world because you were curious to see what would happen, or because it was fun and none of the lives you took even mattered to you, they were just toys to you that you could do what ever you want with, but the people have decided that all Chara ever wanted was to kill everything because they are a 2 dimensional villain.

sorry I went on a rant there...but I just think it's so cool how much thought Toby Fox probably put in his game