St John is a proper noun used in two common forms: as an abbreviated street or institution name (e.g., St John Ambulance) and as a personal or place name. It is typically pronounced with the initial aspiration and the name portion following the 'St' abbreviation, producing a two-part pronunciation that may vary by locale, but generally preserves 'St' as /sənt/ or /sɪnt/ and 'John' as /dʒɒn/ (UK) or /dʒɑːn/ (US) in most contexts.
Full pronunciation guide
