to know or be familiar with someone or something, to know (about something); to be aware that it exists or is true
I know someone who can play the keyboard, though not as well as you.
— ラ・ラ・ランド (2016)
Are you a lobster worshipper who knows the Lobster Man of Yarmouth?
— どん底作家の人生に幸あれ! (2019)