Gillion \gi(l)-lion\ as a boy's name is a variant of Gillean (Irish, Gaelic), and the meaning of Gillion is "servant of Saint John".
The baby name Gillion sounds like Gillon, Gillian and Gilleon. Other similar baby names are Gillson, Cillian, Dillon, Gilson, Gilliss, Gillis, Gillen, Gillan, Gilian, Gillies, Gillman, Gilon, Gillroy, Giulio and Killian.