Den is a boy name. It last appeared in U.S. Social Security records in 1958. Den first appears in the data in 1942 and reached its peak in 1942 (6 births). The chart below shows how the name has risen and fallen over time.
How popular is Den? (U.S. births per year)
U.S. births per year, 1942–1958 · hover or tap for the count and national rank · source: U.S. Social Security Administration