Last name Siertsema (Siertsema 
) , all around the world, is a rare cognomen. The family name Siertsema is habitual in Netherlands, where it is quite a rare surname, Canada, where it is a very rare surname, and South Africa.
| VARIANT | COUNTRY |
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| Siertsema | United Kingdom, South Africa, United States, Canada, Netherlands |
| lodewijk hendrik siertsema politician, AW (b. 1786) |
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| lodewijk hendrik siertsema Dutch university teacher, NL (b. 1863) |
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| bertha siertsema Dutch university teacher, NL (b. 1917) |
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| lodewijk h. siertsema Ph.D. Rijksuniversiteit Groningen 1890 |
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