Willian的小名：Billy / Bill
Interestingly, when William III ruled over in England in the late 17th century, his subjects mockingly referred to him as "King Billy."
很有趣的一點就是，當威廉三世統治英國的時候，他的臣民就開玩笑叫他“King Billy”（實際應該是King William）

Richard：Rich / Rick / Dick
In the 13th century people used to name people based on how their nickname rhymes.
在十三世紀，人們通過韻腳來取昵稱。

比如說以下三組表示的昵稱一樣：
Will= Bill
Rick= Dick
Rob = Bob

Did you also know that Jack is also a nickname for John, Jacob and Jackson!
你知道，那個時候，Jack是John，Jacob，還有Jackson的昵稱嗎？
Let us share some common names and their nicknames for both men and women.
讓我們分享一下，一些常見男生和女生的昵稱。

Elizabeth: Betty, Beth ,Liz
Charles: Charlie, Chuck
Catherine: Cathy, Cath
Anthony: Tony
Deborah: Deb, Debbie
Christopher: Chris

There is a lot of conditions but the most important factor is that your name has to be a long one and you want to make It shorter and easier for people to remember !
取昵稱的眾多原因之一就是，你希望自己特別長的名字能夠短一點，并且能夠很容易被記住。