Different meanings depending on the kanji used
Aritomo (written: 有朋 or 存知) is a masculine Japanese given name. Notable people with the name include:
Aritomo Gotō (五藤 存知) (1888-1942), Imperial Japanese Navy admiral,
Yamagata Aritomo (山縣 有朋) (1838-1922), Japanese general and Prime Minister of Japan,
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