In Croatia, Šenija families are Croats (from Cazma area ). In the past century, relatively most of Croatian residents bearing this family name were born in Cazma area and in Garesnica.
Prevalence
About 40 people with faimily name Šenija live in Croatia today, in 18 households. There were 50 of them in the middle of the past century, and their number decreased by 10 percent. They are located and 6 other Croatian places, mostly in Gornja Garesnica in Cazma area (10), Kutina (<10), Sisak (<5), Novoselec in Ivanic-Grad area (<5), and in Gornja Jelenska in Kutina area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1927 in source Emigration Commission Zagreb.