Soarin/Spitfire the Only Officially Named Wonderbolts

Sibsy (An animator working on FiM) recently responded to a question about the Wonderbolts for someone on her DA page.  Apparently Soarin and Spitfire are the only ones with actual names. 

I think a few of them have fanon names, but tbh they are all pretty similiar looking! The mane two are the only ones that really differentiate themselves.