Gracious
Lashanae is a modern American creation, likely formed by combining the popular prefix 'La-' with the name Shanae. Shanae itself is a variant of Jane or Shawna, which are derived from the Hebrew name Yochanan, meaning 'God is gracious'.
Less common today
Lashanae isn't in the latest US Top 1000. It last peaked at #6,940 in 1991.
US births per 5-year period, 1990βpresent (SSA data).