Puerto Rico was the last port when leaving from the Caribbean, Central and South America to Spain and Puerto Rico was the last Spain colony, so it is my guess that everybody departing had to stop here. Aguadilla being in the Northwest was the harbor of choice.During the Spanish control of Puerto Rico I was told that the only Customs office that could handle business in four languages(Spanish, English, French and Italian) was in Aguadilla.
In Aguadilla we have historical families(+150 years) with German(Reichard/Sanders) and Italian(Di Cristina/Yumet) surnames.What all this means is that it should not be surprising to suggest tha Cabán is an Irish surname since Aguadilla was a contact point for people either entering or leaving the New World.
Consider this also, since the 1350's(to the mid 1800's) the North of Europe was going through what is now known as the Little Ice Age,millions died, crops failed, so it made all the sense to move to new countries(U.S.)and warmer weather(Caribbean).