As a deity name
Name 632 of the Ganesha Sahasranāma — Ganesha Purana (Upasana Khanda), as taught by Sage Vyasa / Lord Ganesha
Name 206 of the Vishnu Sahasranāma — Mahabharata (Anushasana Parva), as taught by Bhishma to Yudhishthira on his deathbed
As a Hindi name
शास्ता · noun · masculine
शासक · राजा · पिता — Śabdasāgara
As a Sanskrit word
Meaning
a teacher, instructor, &c. (also applied to Punishment and to the Sword personified)
Scripturally attested Verified derivationMultiple readings (8)Why this matches what you typed
M1 · same meaning "śāstā" is the nominative of "śāstṛ" — the same word in a different grammatical case.
Dictionary citations
śāstṛ m. a chastiser, punisher, MBh.; Kāv. &c.
a ruler, commander, TS. &c. &c.
Alternative readings
More than one analysis survives full verification. That ambiguity is real, so we show every reading rather than pick one silently.
Caveats
Sources contain errors and engines have limits; every claim above carries its citation so you can verify it. This is guidance about names and their sources — not religious or astrological consultation. How we work · Our sources