counter for people
「人」 has other readings with different meanings.
-ian (e.g. Italian); -ite (e.g. Tokyoite)
person
person; someone; somebody
三人で旅行に行った。
Three of us went on a trip.
この部屋には何人いますか。
How many people are in this room?
パーティーに二十人くらい来ると思います。
I think about twenty people will come to the party.