White island or white meadow
Whitnee is a modern phonetic spelling of Whitney. It originates from an English surname derived from Old English place names meaning 'white island' or 'white meadow'.
Less common today
Whitnee isn't in the latest US Top 1000. It last peaked at #3,359 in 1991.
US births per 5-year period, 1990βpresent (SSA data).