Halcy is a girl name. It last appeared in U.S. Social Security records in 1918. Halcy first appears in the data in 1918 and reached its peak in 1918 (5 births). The chart below shows how the name has risen and fallen over time.
How popular is Halcy? (U.S. births per year)
U.S. births per year, 1918–1918 · hover or tap for the count and national rank · source: U.S. Social Security Administration