Gekkan Karatedo published a big article in their May 2007 issue on Higa Yuchoku. The photo in question is included. It lists the kanji as 渡嘉敷唯名. It is read "Tokashiki Imei". The name 渡嘉敷唯明 is also read "Tokashiki Imei" but is not the same person. The second Tokashiki is a member of the Gohakukai and younger brother of the head of that assoication (Tokashiki Iken).