billy 為人名William 昵稱。來自英語詞匯中的一種用人名代替各種叫不出名字或沒有合適名字的物件，如jack, 杰克，千斤頂。
英文詞源
billy (n.)
"club," 1848, American English, originally burglars' slang for "crowbar;" meaning "policeman's club" first recorded 1856, probably from nickname of William, applied to various objects (compare jack, jimmy, jenny).
雙語例句
1. Billy Sullivan had impressed me as a fine man.
比利·沙利文給我留下的印象是他是個很不錯的人。
來自柯林斯例句
2. If you're a Billy Crystal fan, you'lllove this movie.
如果你是比利·克里斯托的影迷，你會喜愛這部影片。
來自柯林斯例句
3. Billy tends to keep things to himself more and shut himself off.
比利往往更多地將事情藏在心里，把自己封閉起來。
來自柯林斯例句
4. He had asked around and learned that Billy was not yet here.
他四處詢問，得知比利還沒到這兒。
來自柯林斯例句
5. Billy Bonds has never been one to avoid a scrap.