The name of the mountain was attested as Fridt Püchl (literally, 'peace mountain') in 1754.^[3] Traditional explanations of the name are connected with the function of the church that once stood there or the idea that it was spared from Ottoman attacks.^[4] However, like other Slovenian toponyms that seem to contain the adjective miren 'peaceful', it may also be derived from miren 'walled' (e.g., Miren) or through dissimilation from the verb *nyrati 'to arise from the ground' (e.g., the Mirna River or Mirna Peč).^[5]

A church dedicated to Saint Francis Xavier, dating from 1793, formerly stood on Mount Mirna.^[6] It was a pilgrimage church where people prayed for storms to be turned away. The church was burned in 1942,^[2] and the bell tower is now used as a viewing platform.

Today Mount Mirna is a popular hiking destination. The Mount Mirna Lodge (Slovene: Planinski dom na Mirni gori) is located 10 m below the summit,^[7] and the summit itself offers good views of White Carniola and the Kolpa Valley.^[8]