Hello! I am also looking for information regarding the Santos name in Cape Verde. My great grandmother's maiden name was Maria da Conceicao Morais (or Moraes), but on her death certificate it states that dos Santos was her mother's maiden name. She married my great grandfather, Luiz Daniel Pereira and then they moved to Massachusetts. Also, my great grandmother had a sister named Margarita, and possibly a sibling named named Paulina or Paulino. I doubt there is a connection (because I'm just not that lucky!) but in the off chance that there is a connection, don't hesitate to contact me! Thank you for your time!
Brianne