This is not meant to be bitchy at all because I LOVE that people do this (subconsciously maybe?). I think most of them haven’t realised or didn’t until a few years after naming their kids! So they’re not really contrived themey names, more coincidental. My own kids accidentally have musicals-related names.
I know siblings:
Fred and Barney (flintstones)
Ariel(la) and Sebastian (little mermaid)
Madeline and Margaret (Maddie and Maggie)
Matilda (Tilly) and Billy
Henry and Harriet (essentially the same name)
and mums and kids:
Ellie and Ollie
Ellie and Belle