O'callaghan rhymes with:
ocallaghan, ocallaghan, ocallaghan, collagen, gilligan, ocallaghan, barragan, bernhagen, buddenhagen, collagen, ellenbogen, finnegan, flanagan, flannagan, gilligan, gruenhagen, hashagen, horrigan, imogen, kernigan, levenhagen, mcclenaghan, mcgettigan, ocallaghan, oregon, sahagun, steffenhagen, sternhagen, traphagen, verhagen