Family name Herrmannsen (Herrmannsen 
) , globally, is a rare last name. The cognomen Herrmannsen is habitual in Germany, where it is a rare surname, South Africa, where it is a very rare surname, and the United Kingdom.
| VARIANT | COUNTRY |
|---|---|
| Herrmannsen | United Kingdom, Germany, South Africa |
Hermandsen, Hermansen, Hermanson, Hermansson, and Херманссон
| august nicolaus herrmannsen German physician and malacologist (1807–1854), DK (b. 1807) |
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