The surname and given name Hammet has English and Norman origins, deriving historically from the medieval personal name Hamon, which traces back to the Germanic element "haim" meaning "home". Alternatively, etymological breakdowns suggest it can combine the diminutive Norman personal name root with French elements or Anglo-Saxon topographical references to low-lying alluvial wetlands, translating generally to "descendant of Hamon" or relating to home and hearth.