Mas is a boy name. It last appeared in U.S. Social Security records in 1929. Mas first appears in the data in 1921 and reached its peak in 1921 (6 births). The chart below shows how the name has risen and fallen over time.
How popular is Mas? (U.S. births per year)
U.S. births per year, 1921–1929 · hover or tap for the count and national rank · source: U.S. Social Security Administration