The name reached its all-time peak in 1997 with 3 births ranking #3824. STABLE Recent data shows the name is currently stable.
Tommy is an affectionate, familiar form of Thomas and therefore carries the meaning twin. It feels warm, informal, and enduringly usable.
Originally a nickname, Tommy became a very common stand-alone given name in English-speaking countries. Its popularity reflects the broader comfort with friendly diminutive forms.