God has a name?

Exodus 6:3 says, "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." Not only is this a weird verse but why would a singular god need a name? He implies that he has a name that those before did not know. Why would a male deity who was floating alone in a totally dark void forever and ever need a name. Did he talk to himself or something?