In Croatia, Strmo families are Croats (from Sinj ). In the past century, relatively most of Croatian residents bearing this family name were born in Sinj and Zagreb.
Prevalence
About 70 people with faimily name Strmo live in Croatia today, in 30 households. There were 50 of them in the middle of the past century, and their number increased by 50 percent. They are located in four Croatian counties, in 6 cities and another small place , mostly in Zagreb (25), Citluk (20), Split (20), Osijek (<5), and in Sinj (<5).
Outside Croatia
Family name Strmo is present in two countries on two continents.
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.