Also there is a lot more name variety now, so even even you pick one in the top 10, there are unlikely to be several in one class, like there would have been in the 90's.
I keep readng this on here, but I don't think it is true.
The sort of environment you are in will make the name more numerous in your area. For example, Muhammad is the most popular name, but some areas won't have any, but they might have 3 Arlos or 2 Milos in a class.
There is more variety now but if you had a class where the names were ones like Isla, Lila, Lily, Layla, Lara, Lyra, Luna, Lola, Sophia, Sofia, Bella, Ella, Ellie, Evie, Eva, Ava, Ivy the variety isn't obvious.
Is it really that different from a class with multiples of Jack, Oliver,Harry Josh, Ben or Emily, Molly etc?