Cognomen Ritso (Ritso 
) , worldwide, is a rare last name. The surname Ritso is characteristic of Estonia, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Nigeria, where it is an extremely rare surname. Very seldom, Ritso is the forename as well as the last name.
| aadu ritso Estonian technical scientist, EE (b. 1915) |
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| morten ritso researcher (ORCID 0000-0003-4266-0149) |
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