Gargan rhymes with:
bargain, dargan, hargan, jargon, largen, sargen, vonbargen, bargain, borgen, dargan, dorgan, goergen, gorgon, gorgone, hargan, horgan, jargon, kollmorgen, largen, morgan, morgen, morgun, organ, sargen, sorgen, steinbergen, vonbargen
Gargan sounds like:
gargano, garrigan, garrison, garson, garzon, georgann, georgene, georgeson, georgian, georgiana, georgienne, georgina, georgine, gergen, gerken, gerkin, gershman, gershon, gershwin, gerson, goergen, gorgon, gorgone, gorgonian, graciano, graichen, grassman, grayson, graziani, graziano, greason, grecian, greeson, gregson, gresham, gressman, grierson, grignon, griscom, grisham, grishman, grissom, grisson, grogan, grosjean, grossman, grossmann, groussman, grozny, gruesome, gurkin