Kaiyu is a very rare variant of Kaye that peaked in 2001 and has since faded.
Kaiyu is a boy name. In 2025 it ranked #12,945 for boy births in the United States (and #26,614 across all names), given to 5 babies. Kaiyu was first reported in SSA data in 2001 and peaked in 2001 (10 births).
Boys named Kaiyu per year · hover for count and boys rank · Source: U.S. Social Security Administration, national data 2001–2025 · U.S.+territories from SSA territory files (1998–2025) · SSA publishes a name only in years it was given to at least 5 babies, so a name may have been in use before — or between — the years shown here