The surname De Leon was in Cadereyta, NL back in the 1600's! Alonso de Leon (Jr.) was born there in 1639, he was married to Agustina Cantu Trevin~o abt 1661 and they had ten children.
Alonso was the third child of Alonso Perez de Leon and Josefa Gonzalez Leal, married in Hichiapan, Hidalgo, 1635. Both died in Cadereyta, NL.
Alonso (father) was the son of Lorenzo Perez (b abt 1573 in Duensalida, Toledo, Castilla, Spain) and his wife Adriana de Leon (b abt 1577 in Castilla, Spain). They had at least two children; Alonso had a brother Juan Perez de Leon.