'Daughter' may mean 'the one who milks' — from PIE *dhugh-ter, reflecting pastoral family roles.
From Old English 'dohtor,' from Proto-Germanic *duhtēr, from PIE *dʰugh₂tḗr. This is one of the most remarkably preserved PIE kinship terms, with cognates in nearly every branch: Greek 'thugátēr,' Sanskrit 'duhitár-,' Lithuanian 'duktė́,' Old Church Slavonic 'dŭšti,' Armenian 'dustr.' The etymology of *dʰugh₂tḗr itself is debated, but one prominent theory connects it to the root *dʰewgʰ- 'to milk,' suggesting 'the one who milks' — a reference to a young woman's domestic role in PIE pastoral society.