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 13
 13			 
					 
					




It should simply be Rus'
"Eesti" only came into existence as an endonym for the nation/people of Estonia in the mid-19th century, and "Estonia" as a word only came into formal English language use in the early 20th century, but it's still in the game as the "Kingdom of Estonia". I fail to see your point.
A title in CK3 must reflect the truest modern historiographical term that describes the medieval territory the title encompasses; hence "Estonia", "Kievan Rus", "Byzantine Empire" and other terms that didn't actually exist at the time.