Pure
Kathaleen is a variant of Kathleen, which is the Anglicized form of the Irish name CaitlΓn. It ultimately derives from the Greek name Aikaterine, though its exact etymology is debated, it has been associated with the Greek word 'katharos' meaning pure since the early Christian era.
Less common today
Kathaleen isn't in the latest US Top 1000. It last peaked at #5,261 in 1994.
American judge and Chancellor of the Delaware Court of Chancery
US births per 5-year period, 1990βpresent (SSA data).