It has its origins in the name of a spice plant, "avish", common to the gardens I lived in growing up. It was just a common girls' name in my world of origin, actually. I didn't care much about the meaning when I took it.

[It was a very spur-of-the-moment thing, and then she was just sort of stuck with it. But she needed to give some kind of first name to the refugee services of the Nexus, upon her being spirited away from Tirazis, and a boys' name wouldn't do.]