About the name Su
Su belongs to the Spanish and Portuguese 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, Su first appears in Social Security records in 1935. It climbed to its best-ever rank of #2479 in 1957, and in 2024 0 babies received the name — 691 in total since 1880. Those are the official counts, not estimates.