It also depends where you live. I'd never heard of Butch
Cassidy until I learned that the names for Butch and
Cassidy from Pokemon are puns (similar to
Jessie and
James). It'd likely not be known by children outside of the US.
The
Cassidy I associate it with is
David Cassidy, but only because my mum was a fan in her teens and she gave me her 70s pop annuals to read as a kid. Though he'd also be unlikely to be known by children. (it's also why I find the name more masculine than feminine)
Cassandra, on the other hand, might be more "bully bait" because of
Cassandra in Doctor Who. Personally I don't associate
Cassandra immediately with the Doctor Who character, I have a couple of others, but the franchise is very popular (duh) and it might be the most well known modern instance of the name.
You just can't account for everything, sadly.
Love the name
Dario, but the kid called
Dario in our primary school class (who I believe has Italian parents at least, if not actually born in Italy) got picked on because his name was similar to Haribo, the sweet brand. You'd think it might be because of
Mario but no.
In effort to try and find a name that can't possibly be bullied, you might end up with exactly that because something new and popular with kids some up and it's literally this thing