Guina families are Croats and they are mostly from Trogir. In the past century, relatively most of Croatian residents bearing this family name were born in Trogir and Split.
Prevalence
About 110 people with faimily name Guina live in Croatia today, in 50 households. There were 110 of them in the middle of the past century, and their number remains constant. They are located in 6 Croatian counties, in 6 cities and threee other places, mostly in Trogir (75), Zagreb (30), Sibenik (10), Split (<10), and in Zadar (<5).
Outside Croatia
Family name Guina (including: Guinna , Guyna ) is present in 43 countries worldwide. "Guyna " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1929 in source Emigration Commission Zagreb.