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Cognomen Jansa (Jansa
, Янса
) , around the world, is quite a rare surname. The family name Jansa is characteristic of Slovenia, where it is quite a common surname, Czechia, and Finland, where it is quite a rare surname. In absolute terms, it is commonest in Czechia, Slovenia, and the United States. Also, Jansa is the forename as well as the last name.