Last name Dahlby (Dahlby 
) , all over the world, is a rare cognomen. The family name Dahlby is characteristic of Northern Europe, particularly Norway, where it is quite a rare surname, Sweden, where it is a rare surname, and Denmark. Measured by absolute frequency, it most frequently occurs in the United States, Norway, and Sweden.
| VARIANT | COUNTRY |
|---|---|
| Dahlby | Norway, Canada, Sweden, United States, Thailand |
| frithiof dahlby Swedish heraldist, SE (b. 1903) |
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håkan dahlby Swedish sport shooter, SE (b. 1965) |
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| tracy dahlby (b. 1950) |
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| tina dahlby researcher |
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| morten dahlby Ph.D. Norges Teknisk-Naturvitenskapelige Universitet 2011 |
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| douglas craig dahlby Ph.D. Stanford University 1996 |
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| magnus lankhof dahlby Norwegian association football player (b. 1999) |
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| johannes holstad dahlby |
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