Lilias is an uncommon, feminine given name of Scottish origin. It is derived from the Scottish form of the Latin 'Elizabeth', meaning 'God is my oath'. Lilias was particularly popular in Scotland during the 19th century but has since become quite rare. The name's unique spelling and pronunciation set it apart from more common forms like Elizabeth or Lily.
The name Lilias has seen fluctuations in popularity over the years, with periods of no recorded births followed by multiple occurrences within a decade or less. Its most popular eras appear to be during the early 20th century and again from 2016 onwards, with spikes of 8 births in both 1915 and 2017, and another spike of 8 births in 2018. The total number of recorded births for this name between 1915 and 2023 is 87.