Last name Янсон (Janson 
, Yanson , Ianson 
) , around the globe, is a common cognomen. The surname Янсон is characteristic of Marshall Islands, where it is a common surname, Sweden, where it is quite a common surname, and Estonia. Measured by absolute frequency, it is commonest in Philippines, the United States, and Germany. Very seldom, Янсон is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Janson, Yanson | Germany, Sweden, France, Philippines, United States |
| Ianson | Germany, Australia, France, United States, United Kingdom |
| Янсон | Kazakhstan, Ukraine, Kyrgyzstan, Belarus, Russia |
Janssonius, and Janszoon
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янсон, юлий эдуардович Russian economist (1835-1893), UA (b. 1835) |
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янсон, алексей кириллович Estonian-Russian educator, EE (b. 1866) |
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янсон, иоанн андреевич LV (b. 1878) |
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| янсон, николай михайлович Estonian Soviet politician, RU (b. 1882) |
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| янсон, яков давидович RU (b. 1886) |
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| янсон, михаил алексеевич RU (b. 1887) |
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| ігор кіндратович янсон UA (b. 1938) |
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Зоя, Юрій, Мария, Марія, Мирон, Алина, Антон, Артем, Артур, Борис, Ганна, Павел, Дарья, Денис, Диана, Діана, Вадим, Лидия, Лілія, Лідія, Любов, Олена, Юрий, Юлія, Юлия, Ігор, Ояр, Том, Яна, Карл, Майя, Алла, Анна, Дар'Я, Дора, Нина, Олеся, Ніна, Віра, Люба, Олег, Инга, Инна, Иван, Яков, Эмма, Эрик, Ілля, Вера, and Ольга