During the Sui and Tang Dynasties, several glossaries called Insho (Chinese dictionary arranged by finals) were compiled, in which the reading of 倭 is 'wa' and 'wi' and 'wa' is said to be the name of a country in Tokai and 'wi' is said to be a word meaning obedience.
隋唐代に韻書と呼ばれる字書がいくつも編まれ、それらに倭の音は「ワ」「ヰ」両音が示されており、ワ音の倭は東海の国名として、ヰ音の倭は従順を表す語として、説明されている。