Trijntje = Catherina. According to Herman Wessels, Trinje, Trijntje = Catharina (Slinger).
From an inventory of Cornelis Luidens and his wife's Reine Halsema possessions in 1708 (with the addition no doubt after 1714:
Schelte Halsema uses seventy acres of lands near Kloosterburen for a rent of 160 carolus guilders.... This was being used since 1714 by Freerk Willems Halsema.
Note the last name of Freerk: obviously a typo
(See "Boelens.." p.511)
Twin sister of Aeltje Ancestry World Tree Julle Hendrikus (JHH)
Information provided to Douglas Halsema ca 3/2000.