Mirna is a female name common among Croats

Croats

Croats are a South Slavic ethnic group mostly living in Croatia, Bosnia and Herzegovina and nearby countries. There are around 4 million Croats living inside Croatia and up to 4.5 million throughout the rest of the world. Responding to political, social and economic pressure, many Croats have...

 and Serbs

Serbs

The Serbs are a South Slavic ethnic group of the Balkans and southern Central Europe. Serbs are located mainly in Serbia, Montenegro and Bosnia and Herzegovina, and form a sizable minority in Croatia, the Republic of Macedonia and Slovenia. Likewise, Serbs are an officially recognized minority in...

. Derived from the Slavic element mir, Mirna means "peaceful." It is often confused with the name 'Myrna' (/myrrhna/), which is not Slavic in origin, but Celtic and means "beloved" , also "tender".

The name is also used in the Middle East, particularly in Lebanon, where it is pronounced "Meer-na".