Hola!
I am from Puerto Rico too and may have a connection through Garnier. My great-great-grandmother was Josefa Garnier Santos, who died in San Juan, PR but apparently was from Santo Domingo (born ~1855). Her parents were Alejandro Garnier and Nazaria Santos. The earliest Garnier I could find in PR is Blas Garnier (who is definitely related to you and came from Marseilles through Santo Domingo) but I can't find a connection to my Garnier. Help? Thx!