Eilish

Irish Gaelic form of ELIZABETH (or sometimes of ALICE).

From Ελισαβετ (Elisabet), the Greek form of the Hebrew name אֱלִישֶׁבַע ('Elisheva') meaning "my God is an oath" or perhaps "my God is abundance". The Hebrew form appears in the Old Testament where Elisheba is the wife of Aaron, while the Greek form appears in the New Testament where Elizabeth is the mother of John the Baptist.

Among Christians, this name was originally more common in Eastern Europe. It was borne in the 12th century by Saint Elizabeth of Hungary, a daughter of King Andrew II who used her wealth to help the poor. In medieval England it was occasionally used in honour of the saint, though the form Isabel (from Occitan and Spanish) was more common. It has been very popular in England since the reign of Queen Elizabeth I in the 16th century. It has also been borne (in various spellings) by many other European royals, including a ruling empress of Russia in the 18th century. Famous modern bearers include the British queen Elizabeth II (1926-) and actress Elizabeth Taylor (1932-2011).

From the Old French name Aalis, a short form of Adelais, itself a short form of the Germanic name Adalheidis (see ADELAIDE). This name became popular in France and England in the 12th century. It was borne by the heroine of Lewis Carroll's 'Alice's Adventures in Wonderland' (1865) and 'Through the Looking Glass' (1871).

From the French form of the Germanic name Adalheidis, which was composed of the elements adal "noble" and heid "kind, sort, type". It was borne in the 10th century by Saint Adelaide, the wife of the Holy Roman Emperor Otto the Great. The name became common in Britain in the 19th century due to the popularity of the German-born wife of King William IV, for whom the city of Adelaide in Australia was named in 1836.