My g-grandfather was William Soares. His father was Captain Emanuel Soares, who was from the Cape Verde Islands. I've been told that he traveled from Virdue Island (Cape Verde Is.), to Boston to New Zealand where he settled and raised his family. It is likely that any family that came with him may have stayed in Boston. I have heard he had several brothers- Innes and Walter (I believe) went with him to NZ.
The Cape Verde Islands at that time were property of Portugal. Let me know if anyone out there has any further information!