Mršo families are Croats and they are mostly from middle Bosnia. In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Kupres area) and in Osijek. In Vrila in Middle Bosnia every third inhabitant had the family name Mršo.
Prevalence
About 140 people with faimily name Mršo live in Croatia today, in 60 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in 8 Croatian counties, in 11 cities and 12 other places, mostly in Osijek (45), Cepin in Osijek area (30), Zagreb (20), Zapresic (<10), and in Kastel Novi (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.