About the name Sunday
Sunday 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, Sunday first appears in Social Security records in 1924. It climbed to its best-ever rank of #985 in 1966, and in 2024 232 babies received the name — 2,920 in total since 1880. Those are the official counts, not estimates.