1) Galician surname 
Fidalgo (lang, lang), from Galician and Portuguese filho de algo—sometimes translated into English as `son of somebody` or `son of some (important family)`—is a traditional title of Portuguese nobility that refers to a member of the titled or untitled nobility. A fidalgo is comparable in some ways to the French gentilhomme (the word also i...
• (n.) The lowest title of nobility in Portugal, corresponding to that of Hidalgo in Spain.
Fi·dal'go noun [ Portuguese See Hidalgo .] The lowest title of nobility in Portugal, corresponding to that of Hidalgo in Spain.