Donigan rhymes with:
swanigan, bennigan, branigan, brannigan, dunnigan, finigan, finnigan, flanigan, flannigan, hanigan, hannigan, henigan, hennigan, lanigan, shawinigan, shenanigan, swanigan
Donigan sounds like:
damson, dancin', danskin, danson, denison, denizen, dennison, denshin, denson, dimension, dingham, dingman, dionysian, domeniconi, dominican, dominicana, donegan, dongen, dongmei, dunagan, duncan, dunegan, dungan, dungeon, dunigan, dunkin, dunkin', dunnagan, dunnigan, dunson, dyansen, dynamism, dynascan