Is Corbin a first name or a last name?

Corbin is both: a family name in some places and a given name in others. It is mostly a family name in France.

How to address someone called Corbin

United States. Corbin is used both ways: about 26,876 people had it as a surname in the 2010 census, and 34,216 babies born between 1950 and 2017 were given it as a first name. Look at where it sits in the name and how the person signs.
France. Corbin is a family name, usually written last. Write Dear Mr. Corbin or Dear Ms. Corbin.
Canada. Corbin is used both ways: 75% of people from Canada with this name in our data carry it as a family name. Look at where it sits in the name and how the person signs.

Not sure which part of a full name is which? Check the full name with the country where the person is based.

People recorded in Wikidata who carry Corbin as a family name or as a given name, by country of citizenship (120 in total).

Country	As family name	As given name	Family name share
United States	49	21	70%
France	23	0	100%
Canada	9	3	75%
United Kingdom	6	1	86%
New Zealand	1	2	33%

Wikidata covers notable people, so counts show how the name is used, not how many people carry it.

As a surname: about 26,876 people in the 2010 census, rank 1,307 among US surnames.
As a first name: 34,216 babies born between 1950 and 2017, 2% of them girls.