Likely a variation of Atlantis, meaning island of Atlas
Alantis is a rare modern coinage, most likely a creative spelling of Atlantis. In Greek mythology, Atlantis refers to the legendary sunken island named after the Titan Atlas, who held up the celestial sphere. As a name, it evokes a sense of mystery, ancient history, and the vastness of the ocean.
Less common today
Alantis isn't in the latest US Top 1000. It last peaked at #6,476 in 1997.
US births per 5-year period, 1990βpresent (SSA data).