Combination of T-prefix and the name Asia
Tanaysia is a modern American invented name. It likely combines the popular 'Ta-' prefix with the name Asia, which refers to the continent or is derived from the Greek word for 'sunrise'.
Less common today
Tanaysia isn't in the latest US Top 1000. It last peaked at #8,192 in 2005.
US births per 5-year period, 1990βpresent (SSA data).