I am a de Castro living in New York City, US. I'm very interested in the de Castro's from Haiti and Dominican Republic. I was born in New York City, and my father was born in Haiti. His father or grandfather - not sure which (My grandfather or great-grandfather) I think was from Dominican Republic married to a Haitian woman, and they moved to Haiti.
My father moved to New York City with my Mom after they got married and had my 2 sisters in Haiti. Then had my brother and me in NYC.
According to my Dad, there were several brothers that originally came from Spain then to Mexico, then to Dominican Republic. At that point they all pretty much split up and got married. Some stayed on in DR, and some went on to Haiti.
That's all I know for now, and I can try to get more info out of my Dad. I do know that the most popular names that most of them may have had either as a first or middle name are: Antonio and Louis (Luis) and I think Joseph too.
Email me if anyone has more info or needs more.... (Click on my user name)