In Croatia, Tvrdelić families are Croats (from Peljesac Peninsula ). In the past century, relatively most of Croatian residents bearing this family name were born on Peljesac Peninsula.
Prevalence
Only a few people with faimily name Tvrdelić live in Croatia today, in one household only. There were 10 of them in the middle of the past century, and their number decreased significantly. They are located in only two Croatian places: in Trpanj on the Peljesac peninsula (<5) and Racisce on the Island of Korcula (<5).
Outside Croatia
Family name Tvrdelić is present in this form only in Croatia.