Gilmour \gi(l)-mour\ as a boy's name is a variant of Gilmore (Irish, Gaelic), and the meaning of Gilmour is "servant of the Virgin Mary".
The baby name Gilmour sounds like Gillmour and Gilmer. Other similar baby names are Ailmer, Delmor, Filmore, Filmer, Gilman, Gillmore, Gilroy, Wilmer, Wilmore and Wilmar.