Allerby is a hamlet in the civil parish of Oughterside and Allerby, Cumbria, England.
Allerby was originally called Ailward's', that is 'ÃÂðelward's, Crosby', afterwards reduced to 'Ailward's bó'." So, "the village or hamlet of Ailward". ( is Old English from the Old Norse , meaning 'village' or 'hamlet'.)