Jan Gjalts Dupon
- Born: 17 Apr 1864, Nijega Smallingerland Friesland Netherlands
- Marriage: Grietje de Jong 1 Jun 1895, Smallingerland Friesland Netherlands
- Died: 29 Sep 1936, Sumar (Suameer) Tietjerksteradeel Friesland Netherlands at age 72
Jan married Grietje de Jong, daughter of Wietze Geerts de Jong and Elske Tjeerds de Jong, on 1 Jun 1895 in Smallingerland Friesland Netherlands. (Grietje de Jong was born on 5 Oct 1870 in Boornbergum (Boarnburgum) Smallingerland Friesland Netherlands and died in 1936.)
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