57%RatingSave Gender Feminine Usage Old Irish [1] Meaning & History From Old Irish síd meaning "peace" or "fairy mound, tumulus" and maith meaning "good". Related NamesFamily Tree·Details Rootssíd + maithOther Languages & CulturesSíomha(Irish) Categories earth, fairies, goodness, landforms, legendary creatures, peace, virtues Sources & References O'Brien, Kathleen M. Index of Names in Irish Annals, available from https://medievalscotland.org/kmo/AnnalsIndex/Feminine/Sithmaith.shtml.