Pure
A rare spelling variation of Katherine, which is derived from the Greek name Aikaterine. The etymology is debated but most commonly associated with the Greek word 'katharos', meaning pure. This specific spelling is an uncommon transposition of the 'r' and 'y' found in the more standard Kathryn.
Less common today
Kathyrn isn't in the latest US Top 1000. It last peaked at #3,897 in 1994.
US births per 5-year period, 1990βpresent (SSA data).