That is ..clever yet somewhat unamusing. Oh Yukarin
Ki"Murasaki"="Yukari"
"Yukari"="Yukarin"
And the character for Yukari's name can also be read as "Murasaki."In other words:
Yu-karinrin,
Yu-karinrin♪Add "ki" to "Murasa" and you get "Murasaki."
"Murasa"+"Ki"="Murasaki."
"Murasaki" being the Japanese word for "purple."