Boy Hefeydd Hefeydd means: Mythical father of Rhiannon. Hefeydd Name Origin: Celtic Share your thoughts about Hefeydd Share Popularity Infographic of Hefeydd name meaning, which is Mythical father of Rhiannon Ask your friends & family about Hefeydd… Share Pin Tweet Email Text Hefeydd Name Popularity How popular is the name Hefeydd? Here’s everything we know. Sorry, popularity data for the name Hefeydd is not available. Share your thoughts on the name Hefeydd Cancel ReplyYour email address will not be published. All fields are required *Name * Email * Your Thoughts * Δ Search Baby Names Quick Search Search Go Advanced Search Name Starts With Ends With Gender Any Boys Girls Only show unisex names Current Popularity [U.S.] Any More Popular Less Popular Origin Select origin… English Latin Hebrew Greek German Irish French American Spanish Arabic Aboriginal African American Ancient Anglo-Saxon Arabic Aramaic Armenian Arthurian Legend Asian Aztec (Nahuatl) Bulgarian Celtic Chinese Danish Dutch Egyptian English European French Gaelic German Greek Hebrew Hungarian Indian (Sanskrit) Indonesian Irish Israeli Italian Japanese Latin Modern Native American Persian Polish Polynesian Portuguese Russian Scandinavian Scottish Slavic Spanish Turkish Unknown Vietnamese Welsh Yiddish Meaning Number of Letters Min Max Syllables [BETA] Min Max Search Baby Names