Eilis is an Irish given name, derived from the Irish form of Elizabeth, which means 'God is my oath'. It was popularized in Ireland by the novel 'Brooklyn' by Colm Tóibín and its subsequent film adaptation.
The name Eilis experienced a notable increase in popularity from the late 1990s to around 2008, peaking at 14 births in 1998 and remaining consistently high until 2008 with double-digit figures each year. However, after 2008, there was a significant decline, with the number of births annually ranging from 5 to 11 until 2023, indicating a decrease in the name's popularity over time.