In Croatia, Glassl families are Croats (from Opatija ). In the past century, relatively most of Croatian residents bearing this family name were born in Bjelovar and Osijek.
Prevalence
About 10 people with faimily name Glassl live in Croatia today, in five households only. They are located in three Croatian cities only: in Zagreb (<5), Opatija (<5), and in Kupinovac (<5).
Outside Croatia
Family name Glassl is present in 8 countries on three continents. The family name "Glassl " is used by some 700 people in Germany , about 50 in the United States , and small number of people in Czech Republic.