| Surname | Teunissen |
| Type | Patronymic |
| Meaning | Son of Teunis (Anthony) |
| Frequency | ~12,000 in Netherlands |
| Hotspot | Gelderland, Utrecht, North Holland |
Son of Teunis — a Dutch diminutive of Antonius (Anthony). A patronymic surname in the established Dutch tradition of -ssen (son of) formations. Teunis was a common given name in the Dutch Reformed tradition
Teunissen is one of the many Dutch patronymic surnames built on the -ssen suffix — son of — applied to a father's first name. Teunis, the Dutch vernacular form of Antonius (St. Anthony), was a popular given name in the Dutch Reformed and Catholic communities of the Netherlands. When hereditary surnames became mandatory under Napoleonic law, families long known as 'Teunis's son' formally adopted Teunissen.
The patronymic naming system was deeply embedded in Dutch culture before the Napoleonic reforms. Teunissen concentrated in Gelderland and central Netherlands, reflecting the regional popularity of the name Teunis in those communities. St. Anthony of Padua was particularly venerated in Catholic southern Netherlands, but the name crossed denominational boundaries.
Teunissen families emigrated through the Dutch Reformed Church networks to South Africa and North America. In South Africa, the name survives as Theunissen — a significant Afrikaner family name in the Free State and Gauteng provinces. In North America, Teunissen descendants are found in Dutch-heritage communities in Michigan, New York, and New Jersey.
Researching Teunissen ancestry? The Netherlands national archives at Nationaal Archief (nationaalarchief.nl) and Genlias hold civil registration records from 1811 onward. The Dutch-South African genealogy archives are held by GSSA in Pretoria. FamilySearch has digitised many Dutch Reformed church records.
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