Cognomen Sijtsema (Sijtsema 
) , in all the world, is a rare surname. The last name Sijtsema is characteristic of Netherlands, where it is quite a rare surname, Norway, where it is a very rare surname, and Germany, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Netherlands, Germany, and South Africa.
| VARIANT | COUNTRY |
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| Sijtsema | Germany, Norway, South Africa, United States, Netherlands |
| bauke sijtsema Dutch Righteous Among the Nations, NL (b. 1895) |
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| catharina sijtsema Dutch Righteous Among the Nations, NL (b. 1902) |
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| sijtske sijtsema (b. 1909) |
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| reintje sijtsema NL (b. 1919) |
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| nienke d sijtsema researcher |
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| sieta sijtsema researcher |
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| jelle j sijtsema researcher (ORCID 0000-0001-5822-7783) |
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| nanna m sijtsema researcher |
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