I've heard that researchers are trying to find a Sephardic Jewish link to the Baca family. While I don't deny that the Bacas may be Sephardic Jews - there were certain many Spaniards who were - I do take issue with the Baca surname meaning "to wail". Most likely the Baca surname comes from Cabeza de Vaca which means "head of a cow" in Spanish. The name was given to a man by the name of Martin Alhaja who guided King Sancho of Navarre towards an unguarded pass by placing a cow skull there. This helped the king to win the decisive Battle of Las Navas de Tolosa in 1212 A.D.