Gracious
Shontia is a modern American creation, likely a rhythmic blend of the prefix 'Sha-' with the name Tia or a variation of the French name Chantal. It is often associated with the meaning 'God is gracious' due to its phonetic similarity to names in the Jane and John family.
Less common today
Shontia isn't in the latest US Top 1000. It last peaked at #5,444 in 1990.
US births per 5-year period, 1990βpresent (SSA data).