Jan Klazes Sytsma
- Born: 27 Aug 1840, Achtkarspelen Friesland Netherlands
- Marriage: Aukje Wessels Kamminga 16 May 1868, Achtkarspelen Friesland Netherlands
- Died: 29 Dec 1912, Achtkarspelen Friesland Netherlands at age 72
 Another name for Jan was Sietsma.
Jan married Aukje Wessels Kamminga, daughter of Wessel Tietes Kamminga and Hiltje Everts Postma, on 16 May 1868 in Achtkarspelen Friesland Netherlands. (Aukje Wessels Kamminga was born on 9 Sep 1843 in Tietjerksteradeel Friesland Netherlands and died on 12 Dec 1931 in Achtkarspelen Friesland Netherlands.)
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