Only a few people with faimily name Michalek live in Croatia today, in two households only. There were 0 of them in the middle of the past century, and their number remains constant. They are located in one Croatian city only, in Djakovo (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1923 in source Emigration Commission Zagreb.