In Croatia, Sekely families are Croats (from Vinkovci ). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Vinkovci.
Prevalence
Only a few people with faimily name Sekely live in Croatia today, in one household only. There were 0 of them in the middle of the past century, and their number remains constant. They are located in one Croatian city only, in Zagreb (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.