What does the name Tsar mean?

The word tsar can be nominative case of scratching in Russian.

Tsar in Sanskrit means dragon (symbol of skythes divinity):

त्सरति त्सर् {} {tsarati {tsar} verb 1 creep on: The Greek word γρυπός (grypos=griffin), meaning 'curved', or 'hooked'.

Afrasiab (very damaging, very scary) or Shahmar (king snake=Saka) was a divine iranian epithet for skythian kings.