This is the 11455th most frequent Polish word.
jacyś
"Jacyś" means "some" or "some kind of" (masculine personal plural).
In this context, 'jakichś' is used to inquire about the presence of unspecified acquaintances.
Czy masz jakichś znajomych w tej okolicy?
Do you have any acquaintances in this area?
Here, 'jakichś' is used to denote uncertainty about the identity of the tourists met by the speaker.
Spotkałem jakichś turystów w muzeum.
I met some tourists in the museum.
Here, 'jakichś' is the plural masculine form of 'jacyś,' suggesting an unspecified group of people observed by the speaker.