https://www.behindthename.com/top/meta.php
Here you can find some "alternative" popularity lists based on the SSA's "beyond the top 1000" data. These lists rank features of the names instead of the names themselves. For example, you can list and/or graph the most common initial letter in US baby names or the most common length.
(I thought it interesting how the initial letter often trends similarly for male and female names eg:
https://www.behindthename.com/top/metagraph.php?value=e&dimension=letter)
There are also listings that group the names by similar sound. For example, Jackson and Jaxon both reduce to "jaxon", so they are grouped together. When looking at these rankings, you can hover your mouse cursor over the row to see which names were grouped together.
I've put a link to this on the main popularity page, but it's hard to spot so I thought I'd post it here too.