A polyglot.
A linguist is someone who studies languages. Apolyglot is someone who speaks more than 2 languages.
the person who speaks and write many languages is known as linguist and the person who speaks , write and research is known as bilingual
The person who is able to speak or write several languages is called the " Polyglots ".
Yes. In some countries the ability to speak several languages is common because, for instance, the father speaks one and the mother another. See the link below for more information.