1) Indian family name 
Ranganathan (Tamil: ரங்கநாதன்) is a South Indian name. It is derived from the Sanskrit name Ranganatha, which is the name of the Hindu god Vishnu, as depicted resting on the nāga Shesha. The name derives from the Sanskrit words ranga, meaning `place of assembly,` and nath, meaning `protector,` and thus by extension the name ...