Your version of the origin of the Cabán last name sounds very logical. However, there was a Cabán de Avilés family in Aguada, of noble origin, in the 1700's. Please look at the research done by Dr. Adolfo Pérez Comas about the founders of that coastal town.

There is also a very large branch of the Cabán family in Lares. From that branch was Francisco Galeno Cabán, the coffee and tobacco grower and politician who settled in Utuado, where he fathered composer Ketty Cabán. Lets try to find the origins. Is Mrs. Reichard talking about the Cabán de Avilés?