Gillan \gi(l)-lan\ as a boy's name (also used as girl's name Gillan), is a variant of Gillean (Irish, Gaelic), and the meaning of Gillan is "servant of Saint John".

The baby name Gillan sounds like Gillon, Gillian, Gillen, Gilian and Gilean. Other similar baby names are Dillan, Gilman and Gillman.