The story
cinnamon + roll. In reference to the character, derives from a headline in The Onion satirical newspaper, "Beautiful Cinnamon Roll Too Good for This World, Too Pure" (23 January 2014) https://web.archive.org/web/20200306125704/https://local.theonion.com/beautiful-cinnamon-roll-too-good-for-this-world-too-pu-1819576048/amp.
Etymology from Wiktionary, CC BY-SA 4.0.