I like
Lucilla and always have. Much nicer than whiney
Lucille and frilly
Priscilla! Since it would probably shorten to
Lucy, that might be a consideration, but then I love
Lucy and almost used it for my first DD.
I don't like
Julia or
Marcelle or Tertia.
Justine is good, if it counts, but not
Justin. Maybe
Justinian as a mn! I prefer
Marcus to
Mark and
Julian to
Julius.
Also, some less authentic than others:
Adrian (not
Hadrian);
Antonia;
Cecily (not
Cecilia or
Caecilia);
Celia (not
Caelia);
Horatio (not
Horatius in spite of the Bridge);
Marinus rather than
Marina;
Marius, somewhat; and
Paul but not the fem forms.