What is right phonetic & what's meaning?

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EFNYSIEN, is-it [Yven'ochien, Yvano-chien, ʃjɛn], one "Yvan, Evan Bitch, Dog; or Great (an end in superlative AN, AGNE, or in contrary, a diminutive, like in BACH, BECHAN, BIAN = Small, little, dwarf; suffixe -AIN = Cut, reduced, shrivelled, wizened, low?)", or is-it "Even Ossian", the same, or, as Ossian; or others [Evenéchiant] = boring, annoying (but also the words "Evanescent, Falot = Bland, vapid, dying, fading"), or [Yvanochien, Ufené-ki-ɛn]??? And so, what-is the real or true meaning of this name following the old-Welsh language? Because in French this name of "EVENCHIEN" (AS-DOG, or "who wants to be just a dog, watchdog (molosse)") gives enough disgusting meanings, for one Gal, Celt or Roman (Revengor), in old-Welsh or Galloys = Gallia language, French?

But I think, that always in Welsh Tales, there are several possible readings (as views or looks in a mirror): from the more stupid, or infantile, childish (american mind, or saxon, english) or like priest, holly joe; until the more satirical and critical, for people with a big spirit (great humor) like beird (Authors = Autorities, Poëts, well-read; not "scholarly = clerical, literate, churchy").