There's a thing for rhyming names round here.
I kid you not, my DD's year group has 2 sets of twins- Hanna and Janna; and Leah and Diya. (Outs self to anyone from the same school!)
A few years ago, I taught sisters, around 5 years apart- Chloe and Zoe.
I don't get what people are thinking when they do this.
In terms of apostrophes, I've taught a L'Wren. I've also taught a Cheval.
I've taught a group of siblings all named after cars- I won't name them because that really, really would be too outing.