Lydia Alexandria/Alexandra is my first thought. Also:
Lydia PatriceLydia RachelLydia CadenceLydia MasonLydia CarolineLydia SimoneLydia Susanne
Althea LydiaArabelle
LydiaChristine LydiaKaylee LydiaBrittney LydiaScarlett Lydia
I'm sorry if these don't match your requirements. It's really hard to think of something that's not a "filler" (and I happen to like most fillers).
Hope you like them!
Sherlock: Alone is what I have. Alone protects me.
John: No. Friends protect people.
~BBC's
Sherlock