Where does “BL” come from?

BL (Japanese) comes from Japanese ボーイズ ラブ, from English Love, from Middle English love, from Old English lufu, from Proto-West Germanic *lubu, from Proto-Germanic lubō, from Proto-Indo-European lewbʰ-, from Proto-Indo-European lēw- — to sound, resound, sing out; to leave.

Ancestry of “BL”, step by step

StepLanguageWordMeaning
1Japaneseボーイズ ラブ
2EnglishLoveradiotelephony clear-code word for the letter L
3Middle Englishlovelove; strong and deep affection
4Old Englishlufulove
5Proto-West Germanic*lubulove
6Proto-Germaniclubōlove, affection
7Proto-Indo-Europeanlewbʰ-to desire, covet, want; to admire, praise; to...
8Proto-Indo-Europeanlēw-to sound, resound, sing out; to leave

Words derived from “BL

Every word from Proto-Indo-European lēw-Every word from Proto-Indo-European lewbʰ-Every word from Proto-Germanic lubō