Nairobi ranked #2858 among U.S. baby names in 2024. Since 1971, 1,490 babies have been named Nairobi, peaking in 2021 with 242 births. The 2020s were its biggest decade, with 1,006 births. Nairobi is on the rise, up about 525% over the past five years. It is predominantly a girls' name.