how to generate related queries in google search engine result page?

like if i search "John Cena" on google,

at end of SERP, we see queries -
john cena funeral
john cena age
john cena wife
john cena net worth
john cena sr.
john cena wwe
john cena meme
john cena news

I also see some less popular people for whom literally no one searches, got such queries for them - i think they bough google traffic for those keyword links but i am unsure?does someone know

?

those are related keywords and people do look them up, or else google would not suggest them as google is a bot that registers and records people's inputs into it, that's why it can suggest those keywords.