Tvrdeić families are Croats and they are mostly from the Island of Korcula. In the past century, relatively most of Croatian residents bearing this family name were born in Split and Dubrovnik.
Prevalence
About 80 people with faimily name Tvrdeić live in Croatia today, in 40 households. There were 100 of them in the middle of the past century, and their number decreased by 20 percent. They are located in four Croatian counties and 6 other places, mostly in Zagreb (25), Pupnat on the Island of Korcula (25), Split (10), and in Zrnovo (10) and Cara (10) on the Island of Korcula.
Outside Croatia
Family name Tvrdeić (including: Tvrdeic , Tvrdeich ) is present in 6 countries on three continents.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.