Family name Castrén (Castrén 
) , worldwide, is a rare surname. The last name Castrén is characteristic of Finland, where it is quite a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Castrén | Finland, United States |
| christer castrén Finnish judge, FI (b. 1728) |
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| eric castrén FI (b. 1732) |
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matthias alexander castrén Finnish ethnologist and philologist (1813–1852), FI (b. 1813) |
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| matthias castrén Finnish priest and biologist (1764–1845), FI (b. 1764) |
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natalia castrén Finnish culture personality and salon hostess, FI (b. 1830) |
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jonas castrén Finnish politician, FI (b. 1850) |
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kaarlo castrén Finnish politician and Prime Minister (1860-1938), FI (b. 1860) |
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arthur castrén Finnish politician, FI (b. 1866) |
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jalmar castrén Finnish politician, FI (b. 1873) |
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| leontine castrén FI (b. 1817) |
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| zachris castrén FI (b. 1817) |
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gunnar castrén Finnish professor, FI (b. 1878) |
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urho castrén Finnish politician (1886-1965), FI (b. 1886) |
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| robert castrén Finnish politician and journalist (1851-1883), FI (b. 1851) |
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erik castrén Finnish professor, FI (b. 1904) |
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Mona, Lalli, Lassi, Leena, Janne, Johan, Jonna, Jenny, Taina, Erkki, Ville, Ilona, Ilkka, Markus, Sakari, Kaarlo, Päivi, Luukas, Joonas, Julius, Niklas, Helena, Laura, Petri, Klaus, Kaisa, Sari, Anna, Aino, Aura, Kati, Riku, Jani, Jari, Nina, Essi, Christa, Erik, Eero, Olli, Marja, Matti, Maija, Merja, Micko, Sanna, Saara, Antti, Emma, and Johanna