In Croatia, Gillich families are predominantly Croats (from Orahovica area ), rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Orahovica area and in Rijeka.
Prevalence
Only a few people with faimily name Gillich live in Croatia today, in two households only. They are located in two Croatian cities only, in Rijeka (<5) and Osijek (<5).
Outside Croatia
Family name Gillich (including: Güllich , Gyllich ) is present in 21 countries worldwide. The family name "Gillich " is used by some 800 people in Germany , about 200 in the United States , and some 200 people in Hungary.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.