[Facts] Re: What do the names Felisberto and Felisberta mean?
Seems you're right, Felisberto and Felisberta, and probably Felixberto/Felixberta seem to be scribal variations of Filiberto/Filiberta, but these as well are 15 C. and the Fili- theme seems to be borrowed from Filippus, Greek Φίλιππος (in which case the theme is mis-analyzed, as the Greek theme is Φίλ-, not Φίλι-). The Germanic cognate is Bil-/Bel- "kind, good, merciful", rare enough in prosaic use the theme is usually interpreted as bil "machete, single-edged sword"