Family name 洋治 (洋治 
) , globally, is a very rare last name. The last name 洋治 is characteristic of Eastern Asia, particularly China, where it is an extremely rare surname. More frequently, 洋治 is the forename as well as the last name.
| 大橋 洋治 Chairman of the Board of Directors - ANA Holdings Inc., JP (b. 1940) |
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| 豊原 洋治 Japanese businessman, JP (b. 1942) |
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