In Croatia, Kett families are Croats (from Petrinja ). In the past century, relatively most of Croatian residents bearing this family name were born in Vukovar.
Prevalence
About 10 people with faimily name Kett live in Croatia today, in four households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in four Croatian cities only: in Petrinja (<10), Vukovar (<5), Peroj in Pula area (<5), and in Pula (<5).
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.