舌の音も乾かぬうちにONLINE ETYMOLOGY DICTIONARYへ寄ってみたところ、probablyで始まる異説あり、忙しい。諸説有りの見本のような：

nerd, also nurd, 1951, “a person lacking in social skills, fashion sense or both” (Partridge Dictionary of Slang). U.S. student slang, probably an alteration of 1940s slang nert “stupid or crazy person,” itself an alteration of nut. The word turns up in a Dr. Seuss book from 1950 (“If I Ran the Zoo”), which may have contributed to its rise.

HHHHHMMMMMMMMMMMMMMM. You learn something different everyday!