Efnisien as a Baby Name. Meaning and Origin of Efnisien

What is the meaning of the name Efnisien ?

The baby name Efnisien is a Male name , 4 syllables long and is pronounced /ɛvˈnɪs.iɛn/ (ev-NIS-ee-en).

Efnisien is Welsh in Origin.

Efnisien is a Welsh masculine name rooted in medieval literature, most notably the Second Branch of the Mabinogi. Linguists regard its etymology as uncertain; some link it to elements implying strife or hostility, a reading shaped by the character’s quarrelsome nature, while others treat the form as obscure. The paired figure Nisien, his gentle twin, underlines a good/bad contrast embedded in the narrative rather than a securely defined lexical meaning.

Attested in manuscripts of the 12th–13th centuries and popularized in English via Lady Charlotte Guest’s 19th-century translation of the Mabinogion, Efnisien belongs to the mythic cycle of Bran and Branwen, where he mutilates Matholwch’s horses and later destroys the Cauldron of Rebirth at the cost of his life. Modern usage is rare but sees occasional revival among Welsh heritage and fantasy-literature enthusiasts. Variants and spellings include Efnissien, Efnisyen, and Evnissyen.

⚙ We can't find Efnisien in any of the birth registries or name datasets we track. Names like this are usually very rare, tied to a particular region or tradition, or freshly invented. Whatever the reason, hardly anyone else has it.