What name is given to the four holy books of the Hindus?

1. The 4 Vedas 2. The Upanishads 3. The 18 Puranas 4. The Bhagavad Gita.

http://wiki.answers.com/Q/What_are_the_holy_books_of_Hinduism

Or if you mean the 4 Vedas. Rig-Veda,Yajur-Veda,Sama-Veda,Atharva-Veda.

https://en.wikipedia.org/wiki/Vedas

The Vedas, Upanishads, Puranas, and Brahmanas Granth are the four sacred books in Hindu religion. The last one is a commentary on the Vedas, but it is considered as a revealed book. These books are in Sanskrit, the sacred language of the Hindus. The Vedas are divided into four books: Rig Veda, Yajur Veda, Sam Veda and Atharva Veda. Of these, the first three books are considered the more ancient books, and the Rig Veda is the oldest of them. The Rig Veda was compiled in three long and different periods. Opinions greatly differ as to the date of compilation or revelation of the four Vedas. Swami Daya Nand, founder of the Arya Samaj, holds the opinion that the Vedas were revealed 1.3 billion years ago, while others (Hindu scholars and orientalists) hold the opinion that they are not more than four thousand years old. Analysis of the Vedas reveal differences in the accounts of the places where these books were revealed and the Rishis (Prophets) to whom these scriptures were given. Nevertheless, the Vedas are the most authentic scriptures of the Hindus.

http://www.cyberistan.org/islamic/prophhs.html