Evnissyen as a Baby Name. Meaning and Origin of Evnissyen

What is the meaning of the name Evnissyen ?

The baby name Evnissyen is a Male name , 3 syllables long and is pronounced /ɛvˈnɪsjɛn/ (ev-NISS-yen).

Evnissyen is Welsh in Origin.

Evnissyen is a masculine name from Middle Welsh tradition, appearing in the Second Branch of the Mabinogi. Variant forms include Efnisien (modern Welsh), Efnissien (older orthography), and Evnisien. Scholars read the name as signifying “ill‑natured” or “of hostile disposition,” deliberately contrasted with his twin Nisien, whose name suggests “good‑natured.” The pairing likely reflects a Brythonic linguistic play on opposing temperaments rather than a precise, reconstructable etymology.

As a personal name, Evnissyen is overwhelmingly literary and has seen little historical use beyond medieval manuscripts and modern retellings. In the tale he is the volatile half-brother of Bran and Branwen; his mutilation of King Matholwch’s horses ignites the catastrophic Irish–Welsh conflict, yet he ultimately redeems himself by destroying the Cauldron of Rebirth at the cost of his life. Contemporary revival is rare, chosen chiefly by enthusiasts of Welsh myth for its dark, complex resonance.

⚙ Evnissyen turns up in none of the birth registries or name datasets we cover. Names like this are usually very rare, tied to a particular region or tradition, or freshly invented. However you look at it, very few people share it.