My father Eduardo Caban, told me that Caban is an Irish surname, that 3 brothers,most likely in the early 1700's, came to PR and settled in Moca, which is a beatiful green countryside. I have a book on Venezuela emigration to PR from 1810 to 1840, in the thousands of entries there is not a single Caban.If you look at an ancient Ireland map you will find a region called Cavan.My father's Grandfather on his fathers side was called Geronimo Caban born in Moca apprx. in 1820(according to the US 1910 Census). An Aguadilla historian Don Herman Reichard(RIP) wrote a note to my father stating that he found a marriage certificate of a person with a Caban surname fo the 1750's. For the 1910 US Census, there were 1320 entries for Caban, all but 10 to 20 were from PR, at that time if my memory serves me correct about 50% of towns had a person with Caban name. If my great-grandfather was born in 1820, that maens that there was someone previous with the name, at least by mid 1750's.Some 20-30 years ago when the phone book in PR was one,plus San Juan Metro, I made a list with a map of towns with Caban name phone #, most the towns-except 5 to 8 towns-had a Caban name phone #. The towns with over a 100 entries were Moca and Aguadilla. One thing is for sure in all that I have read of people looking for Caban surname roots, not a single one claims for it to be spaniard.