Hargan rhymes with:
bargain, dargan, gargan, jargon, largen, sargen, vonbargen, bargain, borgen, dargan, dorgan, gargan, goergen, gorgon, gorgone, horgan, jargon, kollmorgen, largen, morgan, morgen, morgun, organ, sargen, sorgen, steinbergen, vonbargen
Hargan sounds like:
harcum, harken, harkin, harrigan, harrison, harsham, harshman, heroism, herrhausen, hershman, hersman, hersom, herson, hirosakima, hiroshima, hirschman, hirschmann, hirshman, horgan, horizon, horrigan, horseman, horsemen, horsham, horsman, hourigan, hurricane