In Croatia, Lucas families are Croats (from Zagreb ).
Prevalence
About 10 people with faimily name Lucas live in Croatia today, in two households only. They are located in three Croatian cities only: in Zagreb (<5), Osijek (<5), and in Velimirovac (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over thirty times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.