Possibly a variant of Sayre, meaning a woodworker or sawyer.
Syer is a rare surname-turned-first-name with roots likely tied to the occupational name Sayre. It historically refers to a person who worked with a saw or lived near a marshy area. In modern usage, it is often chosen for its sleek, phonetic appeal and its similarity to names like Sawyer or Cyrus.
About 11 boys were named Syer in 2025.
US births per 5-year period, 1990–present (SSA data).