The name Eilis is a girl's name of Irish origin meaning "pledged to God". Eilis and is often added to lists like Unique Irish Baby Names and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
Thanks to the lovely movie Brooklyn based on the Colm Toibin novel of the same name, we now all know that this name rhymes with Irish. But as with many Irish names , that isn't evident from this spelling, at least to English speakers. Popular in medieval times, it is still used in Ireland and maybe make an alternative to the super-popular Isla. Eilish, Eillish and Eibhlis are alternate forms.