Hare Krishna,

                       I have found this article which says that Guru Nanak is the Kalyug Avatar and his name is also mentioned in the Vedas long before he came.

How is this possible ? And not just one place, he is mentioned in many places .

Here are some examples - 

1. In the Hindu epic the RIG VEDA

(i) In Mandala 7, Ush 5, Mantra 5 and Chapter 6

“Bee chakram prithoi aishai ta khestraaeh Vishnu mansai das sayaan throvaah so asaya keeryo janaas oeroo khashatra so janama chakaar (8)”

meaning

“When in the world the sinful ways will be on the rise and noble behavior will vanish, as the disappearance of the moon when on its wane on the darkest night, there will appear Vishnu as a prominent Prophet from the Keshatra Clan and will manifest in consecutive form through 10 Prophets to bring back the ways of virtue to the ailing world.”

(ii) In the same Vedas, in another part even in the name NANAK and the clan he belongs to is recorded thus -

“Sri Nanak gureng vareng saklaath heythoo. Heitha samasth jagathaa va veithee kaetheng”

meaning

“For the preaching of religious ways and the earning of good karma, there will manifest Guru NANAK from the clan of the Veithees”

(iii) At another position in the same Vedas is entered under Mandala 1 Soothak 5 and in the 7th Mantra thus -

“Eeth eethei Vishnu reinn chakramei threihaa nathathei patham”

meaning

“The Prophet in the Kali Yuga will manifest three attributes. As an Avtar propounding Truth, as a Householder establishing family life and at the same time be a Raja Yogi”

In the BHAVEKHATH PURANA

BHAVEKHATH means "future foretelling." There are numerous places in this famous Hindu epic where the advent of Guru NANAK is directly alluded to. These instances are listed hereunder -

(i) “Theraa bhaareng thereshtwah keli krethem maha krethyaa. Aeveng vaee tharam parchaariang bhavekhthee thaa kalau. Thatha vei loka rakheiaartheng maleishana naas heithwei paschmeitlheng subh theisay vath wensei chei Nanaka naam nach rekhiang brahem geaanaik manas bhavekhet kaloe skunth thatar verth kaleaah har (35).”

meaning

“In the Kali Yuga when goodness in the world is deteriorating there will appear a Prophet from the Beithi clan named NANAK who from birth will be endowed with extra-ordinary spiritual power. He will preach on the nobility of life and the eradication of the sinful ways”

(ii) In another portion of this book the following short cogent quotation supplies further pertinent information on the advent of Nanak

“Guru thaa Brahma, Guru raa Vishnu, Guru raa dev maheshra saakhyaar Parbrehem Thasmei NANAK nameh”

meaning

“The Guru of the prophets, Brahma, Vishnu and Shiv ji is God almighty himself. This very Creator will manifest itself as a human, in the form of one whose name will be NANAK”

Any clarification please ?

The full article is on the following link - 

http://adishakti.org/_/prophecies_about_guru_nanak_in_hindu_vedas.htm