In Croatia, Thomas families are Croats (from Porec ).
Prevalence
About 10 people with faimily name Thomas live in Croatia today, in 6 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in 9 Croatian counties, in 7 cities and threee other places, mostly in Zagreb (<10), Gornje Stative (<5), Dubrovnik (<5), Porec (<5), and in Umag (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over sixty times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.