Hanuman is called Maruti because he is the son of Vayu –
the wind god in Hinduism. Marut is one of the numerous names of Vayu. And as
the son of Marut, Hanuman is known as Maruti.
Valmiki Ramayana mentions that a celestial woman named
Punjikasthala was cursed by a sage to be born as monkey on earth. The sage
later repented and told her that she will have power to assume human form when
she desired.
Punjikasthala was then born as Anjana on earth.
Once, Vayu happened to see Anjana in human form and was
enamoured by her beauty. Vayu made love to her in his invisible form. Anjana who
realized that she was violated was about to curse her unseen lover. But Vayu
appeared before her and gave her boon that her chastity will not be lost and
told her that a powerful son will be born to her. This son was Hanuman.
Related
Story of Hanuman Eating Sun
Related
Story of Hanuman Eating Sun