Pet is a unisex name. It last appeared in U.S. Social Security records in 1938. Pet first appears in the data in 1900 and reached its peak in 1900 (10 births). The chart below shows how the name has risen and fallen over time.
How popular is Pet? (U.S. births per year)
U.S. births per year, 1900–1938 · hover or tap for the count and national rank · source: U.S. Social Security Administration