Minamoto no Hikaru (源光)
MINAMOTO no Hikaru
Regarding a court noble in the Heian period, MINAMOTO no Hikaru (a prince of Emperor Nimyo, udaijin [minister of the right]), refer to MINAMOTO no Hikaru (court noble).
In addition, the main character of "Genji Monogatari" (The Tale of Genji), HIKARU Genji is different from the name MINAMOTO no Hikaru. "Hikaru (a shining prince)" is not a posthumous name but a nickname.