In Croatia, Sajdl families are predominantly Croats (from Novska area ), very rarely Bosniaks (also from Novska area ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Novska area and in Koprivnica. In Krivaj in Novska area every thirtieth inhabitant had the family name Sajdl.
Prevalence
About 30 people with faimily name Sajdl live in Croatia today, in 13 households. There were 50 of them in the middle of the past century, and their number decreased by 40 percent. They are located in 6 Croatian counties, in 6 cities and 5 other places, mostly in Krivaj in Novska area (<10), Banova Jaruga (<10), Koprivnica (<5), Bukovlje in Slavonski Brod area (<5), and in Koska in Nasice area (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.