Jacomyntje was daughter of Conelis Mattyssen and Barentje Dircks “va Meppel.” and was likely born in the Harlem section of Manhattan.

She married Pieter van Blarcom and went on to have 12 children; Catharine/Tryntje (m. Myndert Le Fevre), Rachel (m. Abraham Van Seyl), Barentje (m. Abraham Morgan), Margrietje (m. John Wilson), John, Marytje, Cornelis, Elizabeth, Sarah, Gerrit, Jacomyntje and Willemtje.

No additional information is currently available.