In 2018, 50 is the most common age for an American (U.S.) Mark who is registered male with the Social Security Administration. It is the 18th most common male first name for living U.S. citizens.
― Anonymous User 10/11/2018
6
Mark ranked at #10 in the Netherlands in 1975, #6 in 1980, #4 in 1985 (behind Johannes, Dennis, and Jan), and #6 in 1990. The spelling Marc reached its peak in 1976, at #29.