Thielen is a very rare boys' name that peaked in 2019 and has grown less common since.
Thielen is a boy name. In 2025 it ranked #10,567 for boy births in the United States (and #21,814 across all names), given to 7 babies. Thielen was first reported in SSA data in 2018 and peaked in 2019 (34 births).
Boys named Thielen per year · hover for count and boys rank · Source: U.S. Social Security Administration, national data 2018–2025 · 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