It is written デジレー /de ji rei/.
Its used as a name but the "Rei" in "Reiko" means ZERO.
If you mean the word 'grace' itself transliterated into Japanese it would be グレイス /gu rei su/. If you mean an equivalent for it in Japanese you can use 優美 /yuu bi/.
If you mean transliteration of the word into Japanese, it would be グレイス /gu rei su/. Romanization of it would be 'gureisu'.
Za Rei
in Japanese Rei (spell Ray-eee) mean Law or Rule most use in the girl name
Rei is the command to bow. It is often used when instructing students and is the last command for a kata.
Za-rei
レイチェル /rei che ru/ is the Japanese spelling of the name Rachael.
グレイス /gu rei su/ is the Japanese equivalent of 'Grace' as a name.
レイチェル (pronounced rei-cheh-ru)
Bow.