I purposely moved my knight to a different server because of the Legacy System so she wouldn't have the same surname as my Imps of various species.
Being a Rutian Twi'lek and having a fondness for Aayla Secura I wanted Secura as my Legacy name, but it was already taken.
I settled on my alternative Riordan (which has no reference in anything) and revised my story so that while she is still a direct ancestor of Secura, she fell in love with a man of Clan Secura, briefly 'fell' to the Dark Side due to her passion, abandoned the Order, had a baby but finally redeemed herself to the Light (not that she was really deep in the Dark Side anyways) at the cost of choosing the Order over her family and left the child to the care of the father, both of whom she never saw again.
As it stands, I have no idea if I plan on making other characters under the same Legacy name or if I'll just use separate servers.
As someone who does not necessarily 'role-play' but likes to create sensible backstories, I do not like the way the Legacy System is implemented.