Flash is a boy name. It last appeared in U.S. Social Security records in 2019. Flash first appears in the data in 2014 and reached its peak in 2016 (8 births). The chart below shows how the name has risen and fallen over time.
How popular is Flash? (U.S. births per year)
U.S. births per year, 2014–2019 · hover or tap for the count and national rank · source: U.S. Social Security Administration