Last name Jahnson (Jahnson 
) , worldwide, is a rare cognomen. The family name Jahnson is characteristic of Northern Europe, particularly Estonia, where it is quite a rare surname, Sweden, where it is a rare surname, and Norway. In absolute terms, it is the most numerous in Tanzania, Sweden, and the United States. Also, Jahnson is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jahnson | Tanzania, India, Poland, Sweden, United States |
| karl nikolaus jahnson NO (b. 1857) |
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| randall jahnson American screenwriter, US (b. 1959) |
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| staffan jahnson researcher (ORCID 0000-0001-8012-2742) |
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