Cognomen Isaachsen (Isaachsen 
) , worldwide, is a rare surname. The last name Isaachsen is characteristic of Norway, where it is quite a rare surname, Australia, where it is a rare surname, and New Zealand. Measured by absolute frequency, the name is most common in Australia, Norway, and the United States.
| daniel isaachsen NO (b. 1744) |
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daniel otto isaachsen Norwegian politician (b. 1806) |
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| isaach isaachsen Norwegian politician (b. 1774) |
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olaf isaachsen Norwegian painter (1835-1893), NO (b. 1835) |
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| daniel isaachsen Norwegian physicist (b. 1859) |
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| asta lie isaachsen Norwegian author, NO (b. 1861) |
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| isak isaachsen Norwegian writer (b. 1863) |
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| kaja isaachsen Norwegian Women's rights activist, NO (b. 1873) |
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| einar f. isaachsen NO (b. 1905) |
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