The great-grandfather of private eye Hamilton Nash may have had a sister who married a man named Crawford and then moved west to Texas*. (Or vice versa)
If they had a son, they could have Christened the boy with her family name and thus the grandfather of Hamilton Nash would have been first cousin to Nash Crawford, legendary Texas Ranger. And he was legendary. No brag, just fact.
"The Dain Curse"
"Once Upon A Texas Train"
"The Over The Hill Gang"
"The Over The Hill Gang Rides Again"
*And as far as Toobworld cares, they could have founded Crawford, Texas......