hidalgo (n.) Look up hidalgo at Dictionary.com
"Spanish nobleman of secondary rank," 1590s, from Spanish hidalgo, from Old Spanish fidalgo, usually explained as a shortened from filho de algo "son" (Latin filus) "of someone" (Latin aliquis, ultimately from PIE root *al- (1) "beyond"); this is perhaps an imitation of Arabic ibn-nas "son of people," a complimentary title. For alteration of f- and h- in Spanish, see hacienda.