Family name Østmo (Østmo 
) , throughout the world, is a very rare cognomen. The surname Østmo is habitual in Northern Europe, particularly Norway, where it is a rare surname.
| anna henriksdotter østmo (b. 1753) |
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christian østmo (b. 1851) |
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| ole østmo Norwegian sportshooter, NO (b. 1866) |
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| isak østmo Norwegian Sami writer (b. 1934) |
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| einar østmo Norwegian archaeologist and professor (b. 1946) |
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| liv østmo Norwegian author (b. 1953) |
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| ine østmo Norwegian association football player (b. 1999) |
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Jo, Frode, Monika, Bjørn, Oddvin, Wenche, May-Rita, Hanne, Solveig, Andrine, Kristin, Jensmagnus, Emeline, Marianne, Ragnhild, Steffen, Einar, Espen, Terje, Kim, Ole, Arne, Lise, Elin, Hans, Hege, Oona, Marit, Marte, Maren, Stein, Anita, Runar, Jarle, Jens-Magnus, and Marie-Louise