Mertens (in Dutch; Flemish pronounced as /ˈmɛrtə(n)s/) is a surname of Flemish origin, meaning "son of Merten" (Martin). It is the fifth most common name in Belgium with 18,518 people in 2008.
As of 2014, 43.4% of all known bearers of the surname Mertens were residents of Germany (frequency 1:2,728), 34.8% of Belgium (1:487), 8.8% of the United States (1:60,847), 5.9% of the Netherlands (1:4,188), 1.7% of France (1:57,632) and 1.0% of Brazil (1:299,871).
In Belgium, the frequency of the surname was higher than national average (1:487) only in one region: Flemish Region (1:367).
In Germany, the frequency of the surname was higher than national average (1:2,728) in the following regions:
In the Netherlands, the frequency of the surname was higher than national average (1:4,188) in the following provinces:.[1]