In Croatia, Olei families are Croats (from Buje ). In the past century, relatively most of Croatian residents bearing this family name were born in Virovitica and in Slovenia.
Prevalence
About 10 people with faimily name Olei live in Croatia today, in five households only. There were 0 of them in the middle of the past century, and their number multiplied. They are located in only four naselja i to in Virovitica (<10), Buje (<5), Zidarici on the Island of Krk (<5), and in Umag (<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.