The Holy Apostle Jude also had other names: the Evangelist Matthew terms him "Lebbaeus, whose surname was Thaddeus" (Mt. 10:3). The Holy Evangelist Mark also calls him Thaddeus (Mark 3:18), and in the Acts of the Holy Apostles he is called Barsabas (Acts 15: 22). This was customary at that time.
At times I can barely remember my own name. Why was it "customary" for an individual to have so many differnet names. I have seen many others also have alternate names.
In this century we also have multiple names but they are short for the root name. Not an entirely different name.
Robert = Bob = Bobby
Jude = Thaddeus = Barsabas?
I don't see the root connection.