http://es.wikipedia.org/wiki/Guillaume_Dufay

Du Fay, Guillaume

Fay, Guillaume du

Fayt, Guillaume du

Du Fayt, Guillaume

WWW LC auth. file, 05-06-2006---(Dufay, Guillaume, d. 1474)

The New Grove Dictionary of Music and Musicians, 2001---(Du Fay (Dufay; Du Fayt), Guillaume; b. Aug. 5?, 1397, Beersel, d. Nov. 27, 1474, Cambrai; French composer and theorist; his original patronymic was Du Fayt, apparently altered by him to Du Fay during his years in Italy; the family name (Du Fay, Du Fayt) universally spelled as two words in all 14th- and 15th-century documents traceable directly to bearers of the name)