Etymology
1. * As an English surname, converged from variants of Giles (sometimes through Dutch), Julian, and William.
2. * As a northern English surname, from Middle English gil (“ravine, glen”), from Old Norse gil. The Old Norse is also a source of the Norwegian surname.
3. * As an Irish and Scottish Gaelic surname, variant of McGill.
4. * Also as an Irish surname, variant of Gall.
5. * As a Jewish/Israeli given name, as well as surname, from Hebrew גיל (“joy”).
6. * As a German surname, variant of Gilger.
7. * As a Sikh Punjabi surname originating in India, from ਗਿੱਲ (gill, “moisture”). See: Middle English Nouns '
gil', Old Norse Nouns '
gil'.