hey! did you know that Vader means father in several germanic languages? isn't that cool? I bet you'd like to hear it again, just so you remember better! so i'll say it again, Vader means father!
little hint, German, Dutch, and other languages may not exist in this form in the SW canon, so the significance of Vader, Tyranus, Maul, and Sidious might be different. However, based on what Obi-wan calls vader in episode IV, and Darth Bane's name, I still think "Darth" is a proper name
You all are right... but not exactly
When Sidious gives Anakin the name Vader he will explain to him that HE (Anakin) is the choosen one... The Father... OF THE FORCE
This is Sidious infalting Anakins head and further making him realize that the Jedi were not being truthful to Anakin and were trying to hold him back making Anakin ripe for the turn to the dark side were he will realize his full power