Disable/ Remove /page2 /page3 /page4 etc

Hitting ALL those above url open the same page

ALL the URLs have the same canonical URL though:

<link rel="canonical" href="https://www.babynames4me.com/sample-page/" />

So I wouldn’t worry about this at all.

Please see: https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls

What’s happening is WordPress tries its best to find an existing document to load, even if there’s not an exact match for the permalink. Some would say WordPress tries too much, but it is what it is.

What you’re seeing is just one such instance. There are essentially infinite scenarios where this happens. And these variations should never even surface… unless you or something on your site links to these URLs.

So they’re not different PAGEs (or documents), but different URLs or permalinks for the same PAGE (document).

As long as there’s only one canonical URL specified in the HTML source for all these extraneous URLs (which is always the case, by the way), Google recognizes all of them as one and the same page… and there should be no duplicate content penalty concerns.