Last name Sønju (Sønju 
) , around the globe, is a very rare family name. The cognomen Sønju is habitual in Northern Europe, particularly Norway, where it is a rare surname.
| peder anderssen sønju Norwegian politician, NO (b. 1840) |
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| unn sønju NO (b. 1938) |
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| alvilde celine sønju Norwegian squash player (b. 1994) |
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