Where did the nickname bungy for the surname williams come from?

Question

Where did the nickname bungy for the surname williams come from?

Answer 1

I've never heard the nickname before. I thought there might be some sort of reference to it on this site but there isn't sorry.

Williams Name Meaning and History

English (also very common in Wales): patronymic from William.

hope this helps.

Answer 2

I googled it and it seems that this is prevalent in the British Navy.   There was a whole list of surnames and ready made nicknames.  

It didn't say how the nickname came to be just what it is.