Allan derives from the Gaelic name Áilín or the Old Irish Ailén, ultimately meaning "fair" or "bright," with roots in proto-Celtic *al- meaning "white" or "noble." The name has been used primarily in Scottish, Irish, and English-speaking cultures since the Middle Ages, with notable historical figures including Allan Ramsay (Scottish poet) and its popularity across Protestant and Catholic communities alike.
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Baby name data from babynamesuggestion.com. Popularity figures are Australian registry data and remain subject to the originating agencies' terms.