Deinion as a Baby Name. Meaning and Origin of Deinion

What is the meaning of the name Deinion ?

The baby name Deinion is a Male name , 3 syllables long and is pronounced DAY-NEE-on,DEH-NEE-on.

Deinion is Celtic in Origin.

Deinion is a rare Welsh masculine name best understood as a variant of Einion, a medieval given name with deep roots in Brythonic Wales. Einion is derived from the Welsh common noun einion, meaning “anvil,” which gives the name the figurative sense of “steadfast, firm, reliable.” The initial D- in Deinion reflects occasional historical spellings influenced by Welsh phonology and orthographic variation around vowel-initial names.

The name’s core form, Einion, was borne by early rulers and saints - most notably Einion Frenin of Anglesey - and by several medieval princes and poets, ensuring steady historical visibility. Anglicized variants include Eynon and Enion, which also survive as surnames; Einon appears in some records. Deinion itself is sparsely attested but fits the 19th–21st-century Welsh revival of traditional names. Variants and related forms: Einion (standard), Eynon/Enion (Anglicized), Einon; not to be confused with Deiniol (Welsh Daniel). Meaning: “anvil; steadfast.”

⚙ We can't find Deinion in any of the birth registries or name datasets we track. That's typically a sign of a rare name, a regional or traditional one, or a modern coinage. By any reading, it's an exceptionally uncommon choice.