Pure
Katreena is a phonetic spelling variant of Katrina, which itself is a German and Scandinavian diminutive of Katherine. The name ultimately derives from the Greek name Aikaterine, which has long been associated with the Greek word 'katharos', meaning pure.
Less common today
Katreena isn't in the latest US Top 1000. It last peaked at #5,660 in 1990.
US births per 5-year period, 1990βpresent (SSA data).