1. The Ganapati Upanishad is found in the concluding part of the Atharvaveda. Hence it is also called Atharve sirsa
2. Atharvana is the name is a rsi, the seer - na tharavati, calati iti atharvanah - The one who has no vacillation of mind is call Atharvana
3. The entire veda is called Atharvaveda after him.
4. The Yajurveda has many well-know upanishads such as Taittiriya, the Brhadaranyaka and the Katha
5. Samaveda - Chandogya and Kena upanishad
6. RgVeda - Aitareya Upanisad
7. Atharvaveda contains profound upanishads such as Mundaka, the Mandukya and the Prasna
8. Sri Sankara provided excellent commentaries called Bhasyas for all these upanishads
