Gjalt Jans Dupon
- Born: 21 May 1825, Nijega Smallingerland Friesland Netherlands
- Marriage: Tietje Klazes van der Lei 19 May 1854, Smallingerland Friesland Netherlands
- Died: 26 Mar 1893, Nijega Smallingerland Friesland Netherlands at age 67
Gjalt married Tietje Klazes van der Lei, daughter of Klaas Lieuwes van der Lei and Janke Eelzes Folkertsma, on 19 May 1854 in Smallingerland Friesland Netherlands. (Tietje Klazes van der Lei was born on 27 Jul 1828 in Boornbergum (Boarnburgum) Smallingerland Friesland Netherlands and died on 23 Oct 1890 in Nijega Smallingerland Friesland Netherlands.)
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