Like it's written there, we come from many diffrent Factions... We re a confederation of the People who needed to leave their Home during the Nomad War. -editted due Misunderstanding- I think that's what you wanted to know, right?
or this might be the answer you searching:
"... We collected our Fleet and prepared a Strike against the Governments of the Different Nations. A name was needed and the People let them decide it. The Scientist wanted something Harmonic while the Freelancer decided to stay aggressive. The Turkish Pilot came up with a name what included both of them. We decided us for the Name “Harp” and called our Unity “The Harp Strike Force”. The Instrument “Harp” symbolizes the Harmony between our Unity and the Word, in the Pilots Language, “Harp” means also “War” that symbolizes our Strike Force. Of course this is not the only reason. Every Confederation could be a Tactical War Confederation. But we needed a Diffrent name, a symbolic name and Harp just fits us the best way..." STHC History Book Paragraph 3.
