Riny is a diminutive form of the names Marinus, Marina, or Catharina. It is often used as a nickname or a shorter, more informal version of these names. The name Marinus is of Latin origin, meaning 'of the sea,' while Marina also has Latin roots, meaning 'from the sea.' Catharina, on the other hand, is of Greek origin, derived from the name Aikaterine, which has debated meanings but is often associated with purity or clarity.