Jansma is a West Frisian patronymic surname cognate to "Johnson".Jansma at the Database of Surnames in The Netherlands. People with this surname include:
Bintje Jansma (1888–1976), Dutch school student after whom her teacher named the potato cultivar Bintje Esther Jansma (1958–2025), Dutch writer and archaeologist (born 1962), Dutch bridge player Kristopher Jansma (born 1982), American writer and novelist Rik Jansma (born before 2006), Dutch chef and co-founder of the restaurant Basiliek in Harderwijk, Netherlands Sijtse Jansma (1898–1977), Dutch tug of war competitor Sybren Jansma (born 1982), Dutch bobsledder Timothy J. Jansma (1952–2006), American luthier
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