Lonac families are Croats and they are mostly from east Herzegovina. In the past century, relatively most of Croatian residents bearing this family name were born in East Herzegovina (Trebinje area) and in Dubrovnik. In Trnčina in East Herzegovina every fifth inhabitant had the family name Lonac.
Prevalence
About 90 people with faimily name Lonac live in Croatia today, in 30 households. There were 0 of them in the middle of the past century, and their number multiplied. They are located in two Croatian counties, threee cities and 9 other places, mostly in Dubrovnik (35), Mokosica (<10), Metkovic (<10), Cibaca in Dubrovnik area (<10), and in Vid (<10).
Outside Croatia
Family name Lonac is present in five countries on three continents. The family name "Lonac " is used by small number of people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.