The name Harrill is of English origin, derived from the Old Norse personal name 'Hárr', which means 'strong'. It is a variant spelling of Harry and was likely brought to England by Scandinavian settlers during the Viking Age. The name fell out of fashion during the Middle Ages but experienced a resurgence in popularity in the late 19th century, although it remains relatively uncommon today.
Between 1935 and 1938, there were twelve babies named Harrill.