Mr or not, please help me.

Is this sentence right?

  1. His name is Alan/ Mr. Alan.

If your surname is Alan, your can say ‘his name is Mr Alan’.[YSaerTTEW443543]

TOEIC listening, photographs: The main pipe line[YSaerTTEW443543]

And vice versus, I want to mention his first name I only say " His name is Alan" right?

Tuyet, Torsten’s advice only applies to surnames (family names). If the first name is Alan, then you should not say ‘His name is Mr Alan.’

So if a man is named Alan Cooke, you can say:
His name is Alan.
His name is Alan Cooke.
His name is Mr Cooke.
His name is Mr Alan Cooke.
His name is Mr A Cooke.
If you do not know what his surname (family name) is, then you cannot use the title ‘Mr.’

The same also applies if the person has a middle name. For the name Alan Paul Cooke (where he is usually called Alan) you can say:
His name is Alan.
His name is Alan Cooke.
His name is Alan Paul Cooke.
His name is Mr Cooke.
His name is Mr Alan Cooke.
His name is Mr Alan Paul Cooke.
His name is Mr A Cooke.
His name is Mr A P Cooke.

For the name Alan Paul Cooke (where he is usually called Paul) you can say:
His name is Paul.
His name is Paul Cooke.
His name is Alan Paul Cooke.
His name is Mr Cooke.
His name is Mr Paul Cooke.
His name is Mr Alan Paul Cooke.
His name is Mr P Cooke.
His name is Mr A P Cooke.

If the person’s name is John Alan (and Alan is the surname) you can say:
His name is John.
His name is John Alan.
His name is Mr Alan.
His name is Mr John Alan.
His name is Mr J Alan.

If the person’s name is John Derek Alan (and Alan is the surname) you can say:
His name is John.
His name is John Alan.
His name is John Derek Alan.
His name is Mr Alan.
His name is Mr John Alan.
His name is Mr John Derek Alan.
His name is Mr J Alan.
His name is Mr J D Alan.

et cetera.