Cognomen Sadamune (Sadamune 
) , all around the world, is quite a rare family name. The surname Sadamune is characteristic of Japan, where it is quite a rare surname, the United States, where it is an extremely rare surname, and China. Likewise, Sadamune is the forename as well as the last name.
| hōjō sadamune [北条定宗] samurai of the late-Kamakura period (b. 1268) |
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| hikoshiro sadamune swordsmith (b. 1298) |
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| hōjō sadamune [北条貞宗] samurai of the late-Kamakura period (b. 1350) |
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