SIL and BIL gave their eldest DS the shortened version of my eldest DS's name which I find bizarre. I'm not going to post the real name but think Harrison/Harry, Jonathan/John, Samuel/Sam, it's along those lines and is the only possible short version of DS's name. FIL did point it out to them when they said the name they were thinking of during pregnancy but they said it wasn't the same name and was a totally different name "no one uses as a short version of ", except that everyone does.
I know someone whose DC all have her first name as their middle name. They're all girls so far (four of them) but she's now pregnant with a boy and I wonder if he'll get the same or something different.
I know a sibling set who all have a double barrelled first name and are all called -Star so Eva-Star, Oliva-Star, Layla-Star (not their actual first names). Together they sound like a fleet of cruise liners.
I know two families where the children are named after their parents. So David Snr, Susan Snr, David Jnr, and Susan Jnr. I don't know how it's not really confusing.
I know someone who has used the same letter for all of her DC except one - Leanne, Liam, Zara, Lucy, Lily (again not real names). I feel bad for Zara, especially as this person is currently going through a divorce and has openly told everyone that Zara isn't her husband's child.