I understand that Liam is Irish from the name William. Obviously, it is the last 4 letters of the name. However, I had never heard of Liam until I was an adult. I like the name and have a situation where I am being "requested" to use the name William in honor of someone for the baby. I do not like William, but I like Liam. When it states that the name is a short form of another, if the short form is used, can it be claimed that if the baby is named Liam, it is named after someone named William? Or is this just another nn like Billy, Will etc.? Thanks for any clarification.