Shakespeare's "Logical Names for Twins"?
COMEDY OF ERRORS
Luciana ("light") & Adriana (thought by some to mean "dark")
MIDSUMMER NIGHT'S DREAM
Helena & Hermia (same initials and ending letters, same number of letters)
TWELFTH NIGHT
Olivia & Viola (nearly anagrams of each other)
Sebastian & Viola (actual twins)
-- Nanaea