Gillian \gi(l)-lian\ as a girl's name (also used as boy's name Gillian), is pronounced GILL-ee-an, JILL-ee-an. It is of Latin origin, and the meaning of Gillian is "youthful". Anglicization of Juliana. A common name in the Middle Ages. Actress Gillian Anderson.

Gillian has 15 variant forms: Ghilian, Ghiliane, Ghillian, Gilian, Giliana, Gill, Gillan, Gillianna, Gillianne, Gillie, Gillyanne, Jillian, Jillianne, Jillyan and Jyllian.

For more information, see also the related name Jill.

Baby names that sound like Gillian are Giuliana, Jillan, Jilian, Jilliann, Jilliane and Jilliana.