Aasimar are born to human parents, so they carry the names of whatever human culture raised them — there’s no separate aasimar naming language. That means an aasimar name can come from any human tradition, matching the setting and region your character grew up in.
What often sets an aasimar name apart is tone. Because they’re touched by a celestial guide, many aasimar (or their parents) choose names that evoke light, dawn, hope, or virtue, or that quietly honor the celestial being watching over them. A name with a radiant, uplifting feel signals their heritage without needing an exotic spelling.