Could Moses have written the Pentatech? When was the name of God Yahwe or Jehovah known?

Did the patriarchs know God's name ?
What is the true meaning when Moses was asking 'What is his name?'
Is the revealing of the name of God a prove of multiple authors?
What did Moses ask for ?
Source J.A Motyer : theologicalstudies.org.uk/art...
Jochebed : www.abarim-publications.com/M...