[X] Onmur
I support giving Sabrina a surname for primarily social reasons.
Japanese culture puts quite a bit of emphasis on names and honorifics. Calling someone by their family name (plus honorific) is very common, with given names usually being used by those that are close. By forcing others to use Sabrina's given name, it presumes a certain relationship. It presumes that the other party is close/wants to be close to Sabrina, and/or that they are friends. This could get awkward, especially if the person is polite, the occasion is formal, the relationship is between a superior and subordinate, the other person is slow to make friends, or the other person simply doesn't like Sabrina all that much. Having this allows the other party to set the tone and initial relationship that they are comfortable with.
We can still introduce ourselves as Sabrina, and only give the surname if prompted. Sabrina herself doesn't have to use the name much, it would mostly be a thing for other people outside of our friend group to use.
BTW, are we pronouncing Vee as "Vee" or "Vey?" Because I think that Vee can be pronounced either way, depending on the accent.
(the rest of the vote is good too)