Pure; princess
Kasarah is a modern American invention, likely created as a phonetic blend of Katherine and Sarah. It combines the 'pure' meaning associated with Katherine and the 'princess' meaning associated with Sarah. While rare, it follows the trend of creating unique variations of established classic names.
Less common today
Kasarah isn't in the latest US Top 1000. It last peaked at #7,250 in 1990.
US births per 5-year period, 1990βpresent (SSA data).