In Croatia, Sauer families are almost entirely Croats (from Beli Manastir ), barely Bosniaks, and . In the past century, relatively most of Croatian residents bearing this family name were born in Osijek and Beli Manastir.
Prevalence
About 50 people with faimily name Sauer live in Croatia today, in 30 households. There were 70 of them in the middle of the past century, and their number decreased by 30 percent. They are located in 6 Croatian counties, in 7 cities and 7 other places, mostly in Nasice (<10), Valpovo (<10), Osijek (<10), Samobor (<10), and in Sumarina (<10).
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.