How do you say in Malayalam - who is this?

There are a few ways to say "who is this?" in Malayalam, depending on the context and formality:

Formal:

* ഇയാള്‍ ആരാണ്? (iyaaL aaraaN?) - This is the most formal way to ask "who is this?". It literally translates to "who is this person?".

* ഇവര്‍ ആരാണ്? (ivar aaraaN?) - This is similar to the above, but uses "ivar" which is a more respectful way to refer to someone.

Informal:

* ആരാ ഇത്? (aaraa ithu?) - This is a more casual way to ask "who is this?".

* ഏതാണ് ഇത്? (eethaan ithu?) - This is used when you don't know the person's name and are asking for their identification.

On the phone:

* ആരാ പറയുന്നത്? (aaraa parayunnathu?) - This literally translates to "who is speaking?".

The best option for you will depend on the specific situation and who you are talking to.