In Croatia, Grenko families are generally Croats (from Kraljevica area ), rarely Serbs, and barely Czechs (from Rijeka ). In the past century, relatively most of Croatian residents bearing this family name were born in Kraljevica area and in Rijeka.
Prevalence
About 40 people with faimily name Grenko live in Croatia today, in 20 households. There were 50 of them in the middle of the past century, and their number decreased by 0 percent. They are located in threee Croatian counties and 5 other places, mostly in Rijeka (20), Pula (<10), Delnice (<5), Marcelji in Rijeka area (<5), and in Fuzine in Kraljevica area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.