Spa is an acronym, however there are several proposed answers for what it stands for:• From the Latin words 'Espa' (fountain) and 'Sparsa' (from spargere = to bubble up).• "Sanus Per Aquam" [S P A] - meaning health by or through water.• "Solus Per Aqua" [S P A] Latin for enter by means of water. Other interpretation: "health through water".• “Salut Per Aqua”...