Modern elaboration of Lara or Larissa
Larrisha is a contemporary American creation likely formed by adding the popular '-isha' suffix to the name Lara or Larissa. While its specific etymology is modern, it carries the heritage of its root names, which relate to the ancient city of Larissa or the Latin word for 'citadel'.
Less common today
Larrisha isn't in the latest US Top 1000. It last peaked at #7,839 in 1991.
US births per 5-year period, 1990βpresent (SSA data).