A lot depends on what name suits the guinea. Of the 12 I have named in the past few years (two of my current lot already had names which I kept), only one pig suited the name I had chosen prior to meeting the pig.
Having a shortlist is the best idea...and a big book of baby names too for inspiration!
Buuuuut....of your shortlisted names - the girls names, I like all of them. Of the boys names, I like Oliver/Olly.