Family name Maruoka (Maruoka 
, Маруока, ماروكا) , in the world, is a rare last name. The family name Maruoka is characteristic of Singapore, where it is a rare surname, Japan, where it is a very rare surname, and Argentina. Not in comparison with a country's population, it is commonest in Brazil, Japan, and the United States. Likewise, Maruoka is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Maruoka | Japan, China, Romania, United States, Brazil |
| daiji maruoka born:1913|died:1979|; Maruoka, Daiji, 1913-; 丸岡, 大二, 1913-; Maruoka 1913-1979 Daiji; 丸岡, 大二 (b. 1913) |
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| daisuke maruoka researcher (ORCID 0000-0002-1142-6942) |
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| masahiro maruoka researcher |
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| keiji maruoka researcher |
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| shintaro maruoka researcher |
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| teruyuki maruoka researcher |
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| hirokazu maruoka researcher (ORCID 0000-0002-2852-8742) |
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| shuichiro maruoka researcher ORCID ID = 0000-0003-0118-342X |
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