Where do you get the Latin etymology "white falcon" from? This site here says that Gabinus probably means "from Gabii" (an antique city in central Italy) and this is a clear and transparent Latin etymology. I don't see any of the Latin words meaning "white" (e.g., albus or candidus) in Gabinus, not any Latin word for a bird of prey.
Some fun facts: cinctus Gabinus was a way to wear the toga, and lapis Gabinus was a fireresistent kind of stone
https://www.perseus.tufts.edu/hopper/searchresults?q=Gabinus&page=1
--elbowin