Adelia is an elaborated form of Adela, a Germanic name built on the element adal, which means "noble". It shares its roots with Adeline and Adelaide and was fairly common in 19th-century America before fading. In the United States Adelia ranked number 4292 in 2000, climbed to a peak of number 1828 in 2017 and stands at number 2117 among girls' names in 2025.