In Croatia, Firis families are generally Croats (from Opatija ), rarely Slovenes (from Rijeka ). In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and Zagreb.
Prevalence
About 20 people with faimily name Firis live in Croatia today, in 11 households. There were 20 of them in the middle of the past century, and their number remains constant. They are located in four Croatian counties, in 6 cities and another small place , mostly in Zagreb (10), Opatija (<10), Rijeka (<5), Malinska on the Island of Krk (<5), and in Molvice (<5).
Outside Croatia
Family name Firis (including: Phairis , Phiris ) is present in 6 countries on four continents. The family name "Firis " is used by small number of people in the United States. "Phairis " is used by small number of people in the United States.
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.