Ostin is a variant of Austin, from Latin Augustus meaning 'great' or 'venerable.'
Ostin is a variant spelling of Austin, which traces through the medieval English surname Austin to the Latin Augustinus — a diminutive of Augustus, the title meaning "great," "venerable," or "consecrated by augury" that the Roman Senate bestowed upon Gaius Octavius when he became the first Roman Emperor. The theological giant Augustine of Hippo (354–430 CE) bore the Latinized form, and his influence on Western Christianity was so vast — his Confessions and City of God shaped Catholic and Protestant thought alike for sixteen centuries — that the name became a Christian virtue-name spread by missionaries across Europe and eventually the Americas. Austin as a given name was popularized in the American South and Midwest during the 19th century, partly as a surname-to-given-name transfer honoring Stephen F.
Austin, the "Father of Texas," who led the colonization of Mexican Texas in the 1820s. The city of Austin, Texas, bears his name. By the 1990s and 2000s, Austin had become a mainstream American boys' name, and its alternate spellings — Austen (evoking Jane Austen), Austyn, and Ostin — emerged as parents sought distinction within the familiar sound.
The Ostin spelling, with its opening "Os-" rather than "Au-," subtly alters the name's feel — it reads slightly more Scandinavian or Old English, potentially evoking the Old Norse element *ás* ("god") or simply registering as refreshingly unrecognizable at first glance. For a child, it offers the playground legibility of Austin with the quiet originality of a road less taken.