Only a few people with faimily name Hassan live in Croatia today, in three households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only five naselja i to in Sisak (<5), Cakovec (<5), Zagreb (<5), Donja Lomnica (<5), and in Lopar on the Island of Rab (<5).
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.