Historical baggage. The 'c' doesn't contribute to the sound of the czech 'ch' (russian 'x'), unless you read the 'c' as an english 'k'. Kh as in Kharkiv makes m

Historical baggage. The 'c' doesn't contribute to the sound of the czech 'ch' (russian 'x'), unless you read the 'c' as an english 'k'. Kh as in Kharkiv makes more sense.