A local emloyee of the town of Wommels entered newborn children of Tiemensma (root of Roelof Tijmens from Heerenveen)
as Tiemersma,because his own name was Tiemersma
(root of Gerrit Andries, possibly from the farm
Timertsma-state near the Timertsmar in Grou area)
From then, most spellings of Timmersma, Tymersma and Tiemensma became one and the same Tiemersma