Did Ib Melchior have a hand in the comic? I know from a dedicated Allen fan who corresponded with Ib that he had developed a whole Space Family Robinson concept in the early 60s which he claimed Allen appropriated wholesale. It may be that one of those super-researched limited press books about LiS might have info on this.
If Allen had simply given his space family a new last name, there never would have been any trouble. But instead, they had a troublesome legal entanglement brought by that existing comic book and
we never got a (true-vintage) LOST IN SPACE comic like all the other sci-fi shows got.
Allen could have called them the Space Family Finkelsteins, anything, and it would have been smooth sailing.