Ulli is a diminutive form of the names Ulrich or Ulrike. It is often used as a nickname or a shortened version of these names. The name Ulrich is of Old High German origin, meaning 'prosperity and power,' while Ulrike is the feminine form of Ulrich, also carrying similar meanings. Ulli can refer to various entities, including geographical locations, events, or individuals, as seen in its usage for Pulkovo Airport (ICAO code ULLI) and Cyclone Ulli, a significant European windstorm.