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1. Norwegian: habitational name from any of three farmsteads, so named from the dative singular of Old Norse óss ‘river mouth’.
2. Hungarian (Őse): from a pet form of the old secular personal name Ős.
3. Japanese: ‘small strait’ or (Ōse) ‘large strait’. The latter is mostly found along the coast west of Tōkyō, but neither form is very common in Japan.

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(Dictionary of American Family Names, Oxford University Press)