In Croatia, Joo families are Croats (from Donji Miholjac area ). In the past century, relatively most of Croatian residents bearing this family name were born in Donji Miholjac area and in Orahovica.
Prevalence
About 40 people with faimily name Joo live in Croatia today, in 13 households. There were 10 of them in the middle of the past century, and their number multiplied. They are located in threee Croatian counties, four cities and two other places, mostly in Moslavina Podravska in Donji Miholjac area (20), Zagreb (10), Osijek (<10), Pula (<5), and in Sesvete (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.