Meaning Artist Name Suffix Khan in Bollywood?

Khan is a Muslim clan, in India there is also a system of clan (family identity)

yes, Khan was a person whose religion of Islam in India!! so do not be surprised if a lot of artists that last name khan!

I guess its a title only like "shaikh", "Syed".. Yea, some titles carry the identity beyond religion (As in hindu, "banarjee", "chaterjee"..), origin of family, region of ruling (as "Bhuyian") and so on. Some titles r neutral as "Chowdhury" (means land owner, used before muslim & hindu names..) In muslim, "Syed" is the title which is used after the sons from the Holy Prophet Muhammad (SM)'s family (or his daughter/wife's family). Other companions of the Holy Prophet also used different Titles. Some prominent followers of the Holy Prophet also had some titles ( Bashri/Chishti/Dinar/..). People/their sons showing respects and remembrance, started using these titles. Thats what I know.

Khan's family name ato clan, mostly in the western part of Pakistan or India .. Punjab ... and it is true, Islam Khan's clan name ... usually people who have a clan khan is a person who has a high social class in pakistan or india .