fella (n.)youdaoicibaDictYouDict[fella 词源字典]
attempt at phonetic spelling of a casual pronunciation of fellow (n.), attested by 1864 (as fellah). Feller, along the same lines, is recorded by 1825. Earlier, Pope rhymes fellow with prunella ("Essay on Man," epistle IV).[fella etymology, fella origin, 英语词源]