Meaning of どなたか in Japanese

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Definition of どなたか

どなたか(donataka)

留守中るすちゅうどなたか見えましたみえるか。

Was anybody here while I was out?

向こうむこうにおられるおる方かたはどなたかしら。

I wonder who the man over there may be.

I wonder if you would kindly introduce us to someone.

これに関連かんれんしてするどなたか発言はつげんがありますか。

Do any of you have anything to say in connection with this?

Is this seat taken?