Erluin, also found in the forms Erluinus, Erlwin, Eorlewinus, Herluin, and Harlewin, is a medieval name, composed of the Germanic elements erl, meaning free man or noble man, and win, meaning friend.S.L. Uckelman. "Herluin". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Herluin
Notable bearers of the name include: Erluin (nobleman), prefect of the palace at Ingelheim c. 874 Erluin I of Gembloux, abbot of Gembloux 946–987 Erluin II of Gembloux, abbot of Gembloux 991–1012 Erluin of Cambrai, bishop of Cambrai 995–1012 Herluin de Conteville (died c. 1066), step-father of William the Conqueror Herluin of Bec (died 1078), founder of the abbey of Bec
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