Does stars really exist or they are just a given name?

How can we give the name to the thing that it is not existed in the universe then.

Stars really exist but most of them do not use their real names 

so that is why you might not recognize them all of the time.

Stars do exist

That is why they like to give then names

Only about 1000 stars have names, another 15,000+ have catalog numbers.  Haven't you ever been out at night and seen stars?

I hope you aren't referring to the infamous scam of "buying" star names.

Most of the atoms in your body have been inside several stars since the beginning of the Big Bang.

Yes, stars do exist.

The nearest one is about 150 000 000 km away and we call it the Sun.

Most catalogued stars do not have names but a number.

They both exist *and* have names.  Or numbers, anyway. 

Do you mean 'stars' as large objects in space, or as celebrities?

I don't understand the second part of your question but yes stars exist.  I'm currently typing this answer using the light of a particularly close example.

Noh i think stars really exist.