Drenka is a female name, in Croatia almost exclusively Croatian. It is one of the relatively common names (among the top two thousand) in Croatia, with over two hundred namesakes living there.
The relative popularity of names Drenka in Croatia
The name Drenka was the most popular from years 1924 to 1935. The peak year was 1929.
Prevalence
Name Drenka is relatively more common in the north of the country. Most of the persons named Drenka live in the following cities and municipalities: Zagreb (about thirty), Osijek (less than ten), Rijeka (less than ten).
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.