Hay meadow or clearing
Haislee is a modern phonetic spelling variant of the English surname-turned-given-name Paisley or Haylee. It likely derives from the Old English elements 'heg' (hay) and 'leah' (clearing or meadow), following the popular trend of adding the '-lee' suffix to nature-inspired roots.
Less common today
Haislee isn't in the latest US Top 1000. It last peaked at #2,256 in 2020.
US births per 5-year period, 1990βpresent (SSA data).