There are numerous ways of spelling Toshiko in kanji, for instance:
俊子 "excellence, child"
敏子 "cleverness, child"
淑子 "graceful / pure, child"
聡子 "wise, child
利子 "profit / benefit, child"
~ isla, sophie, embla, zephyra, vida, clementine, swanhilda, calliope, magnhild, salomé ~
~ rémi, archer, louis, aurelian, pollux, lucan, storm, henry, nicodemus, maximilian ~