About the name Cullen
Cullen belongs to the English & American tradition. Its roots are documented, even though its precise meaning is not recorded in the standard references — an honest gap we prefer to a confident guess.
In the United States, Cullen first appears in Social Security records in 1880. It climbed to its best-ever rank of #413 in 2010, and in 2024 187 babies received the name — 16,394 in total since 1880. Those are the official counts, not estimates.