The pronunciation of the imperial princess's name as Shokushi was derived from the yusoku-yomi (pronunciation of a person's name according to the Chinese reading [onyomi] as an expression of respect) used in kado (the art of composing waka, a genre of Japanese poetry) and a respectful way of referring to people of ancient times, according to which 定家 would be pronounced as Teika and 俊成 as Shunzei.
なお、内親王の名をショクシとするのは歌道の有職読みであって、定家をテイカとし、俊成をシュンゼイとするごとく、古人を敬って行う呼び名である。