u/ZivaDavidsWifesWife

I am very very early in my Welsh learning journey, but as a mythology enthusiast who writes about many different legends, I’m attempting to write about the llamhigyn y dwr. In doing so, I’m trying to figure out the plural form for more than one of the creatures (if a plural exists). My best guess so far is llamhigod y dwr. Is this correct?

Thank you so much for your help. I’m trying to be respectful of this beautiful language!