Reginald's rhymes with:
arnold's, arnolds, donald's, macdonald's, mcdonald's, mcdonalds, mcreynolds, reynolds, reynolds', arnold's, arnolds, donald's, emeralds, fitzgerald's, geralds, harold's, herald's, heralds, macdonald's, mcdonald's, mcdonalds, mcreynolds, reynolds, reynolds', scaffolds