The wife of Bartolomeu Dias is unknown, though there is some speculation that it may have been one of his relatives. Records of the marriage probably exist somewhere in Portugal but they have not been found. Diaz had two sons: Simao and Antonio. Both of these boys had the last name Dias de Novais. This refers to the region that either their father, mother, or both were from.
There is no way to check with his descendants, either. His last relatives were a pair of great-granddaughters who died without leaving any children.