Panchjanya, is the common name given to five most ancient vedic

Vedic period

The Vedic period was a period in history during which the Vedas, the oldest scriptures of Hinduism, were composed. The time span of the period is uncertain. Philological and linguistic evidence indicates that the Rigveda, the oldest of the Vedas, was composed roughly between 1700–1100 BCE, also...

 kshatriya

Kshatriya

*For the Bollywood film of the same name see Kshatriya Kshatriya or Kashtriya, meaning warrior, is one of the four varnas in Hinduism...

 tribes. It is supposed they are all descendants of the Five Folks and are known by that name for e.g. Yadav

Yadav

Yādav refers to an umbrella group of traditionally non-elite pastoral communities, or castes, in India and Nepal which since the nineteenth and twentieth centuries has claimed descent from the mythological King Yadu as a part of a movement of social and political resurgence.The term 'Yadav' now...

 for descendants of Yadu

Yadu

Yadu is one of the five Indo-Aryan tribes mentioned in the Rig Veda . The Mahabharata, the Harivamsha and the Puranas mention Yadu as the eldest son of king Yayati and his queen Devayani. The prince of King Yayati, Yadu was a self-respecting and a very established ruler...

, paurav for descendants of Puru

Puru

The Purus were a tribe, or a confederation of tribes, mentioned many times in the Rigveda, formed around 3180 BCE. RV 7.96.2 locates them at the banks of the Sarasvati River. There were several factions of Purus, one being the Bharatas...

and so on. Some scholars believe they were different tribes who came as different waves of immigrants.