Finnigan rhymes with:
finigan, finigan, shawinigan, bennigan, branigan, brannigan, donigan, dunnigan, finigan, flanigan, flannigan, hanigan, hannigan, henigan, hennigan, lanigan, shawinigan, shenanigan, swanigan
Finnigan sounds like:
fanchon, fangman, feminism, fincannon, fincham, finchum, finegan, finigan, finken, finnegan, finnicum, finucane