Hyacinthia rhymes with:
cynthia, cynthia, anthea, cynthia, dianthia, panthea, penthea, alithia, anthea, cynthia, dianthia, forsythia, lethia, panthea, penthea, pythia
Hyacinthia sounds like:
hacienda, hackneyed, hashemite, hashimoto, hasn't, highsmith, hignite, hochmuth, hoshimoto, housand, huguenot, hyacinth, hyacintha, hyacinthe, hyacinthie