John Collins aka Davidson
I am a descendant from both these man, brothers, John and Solomon Collins. John Collins on my fathers side, and Solomon Collins on my mothers side. The story goes that when John Collins returned from the Civil War he changed his last name to Davidson. Generations later, my parents marry.
This is what made completing my family tree difficult. On my fathers side, John Davidson was actually born John Collins. Where one's life seem to stop at around 1863, the others life began and it all happened by a simple name change.
The moral of this story is, when you start researching your family tree, be prepared for a few surprises! Especially when you get your Y-DNA or mtDNA done.