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masc. proper name, Welsh form of John, form influenced perhaps by Welsh ieuanc "young man" (cognate of Latin juvenis), from Celtic *yowanko-, from PIE *yeu- "vital force, youthful vigor" (see young).
Evans Ev·ans (ěv'ənz), Herbert McLean. 1882-1971. American anatomist who isolated four pituitary hormones and discovered vitamin E (1922).