Jehovah's Witnesses
God does have a personal name. Do you use the KJV?
Here is a quote from the KJV: (found at Exodus 6:3)
Exodus 6:3-7King James Version (KJV)
3 And I appeared unto Abraham, unto Isaac, and unto Jacob, by the name of God Almighty, but by my name Jehovah was I not known to them.
Some may argue that Gods personal name is "too holy" for humans to pronounce, hence it was left out of many translations and replaced with different titles such as "Almighty" But Jesus wants his followers to use Gods personal name. (Matt 6:9, John 17:26 for example) True, we may not have the exact pronunciation, as the name was translated from the original text from the consonants "YHWH" (read from right to left) but interestingly, neither do we have the exact pronunciation of Gods son, Jesus, for the exact same reason.
As I've said, the Truth can be found in most any widely recognized Bible translation.
Here is a little something to think about (another informative, but short video regarding Gods personal name): Does God Have A Name?:
What Is God’s Name? Does God Have a Name? | Videos
Does God Have a Name? | Bible Questions