Ailsie is a variant of the name Ailne, which means little dark one or dark-haired one. It is derived from the word ail, meaning dark or black, and the suffix -ie, which is a common Gaelic ending. Ailsie has been in use since the 13th century and is most commonly associated with Scotland and Ireland. In Gaelic mythology, Ailsie was the name of a legendary hero, and it has also been borne by several Scottish and Irish nobles. The name Ailsie is also associated with the Gaelic word ail, which means dark or black, and is often used to describe someone with dark hair or skin.