Last name Janso (Janso 
) , globally, is a rare cognomen. The last name Janso is habitual in Slovakia, where it is quite a rare surname, Thailand, where it is a very rare surname, and Nicaragua. Not in comparison with a country's population, it is commonest in Slovakia, Thailand, and the United States. Also, Janso is the forename as well as the last name.
| jeffrey e. janso botanist |
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| jakub janso Slovak soccer player, SK (b. 1989) |
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| oliver janso association football player, SK (b. 1993) |
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