He is married to Susanna van Hecke.
Permission for the marriage has been obtained in Terneuzen on May 13, 1617.Source 1
They got married on June 11, 1617 at Axel.Source 11617-05-13 ondertrouw binnen Terneusen (getrouwd alhier 11 juni), Willem Leuniss j.m. van Triniteyt met, Susanna van Hecke j.d. van Axel ende won. aldaar
Child(ren):
Axel, transcriptie ref. trouwboek 1604-1648, 1653-1691, 1691-1729, 1729-1749, 1750-1791 en 1791-1796 http://www.geneaknowhow.net/script/zeeland.html