In the Celtic origin, Gall means "Stranger"
In the Irish origin, Gall means "Gall \g(a)-ll\ as a boy's name. May possibly refer to Gaelic, since Saint Gall was one of the many seventh-century Irish monks who brought Christianity back to the continent of Europe after the Dark Ages.
Baby names that sound like Gall are Gael, Gale, Gal, Gaill, Gail, Gaell, Galo, Gallo and Gill. Other similar baby names are Galil, Galt, Hall and Pall. "
