I love this stuff:
Alice/Celia: This subtle anagram yields two charming classics with completely different sounds.
Beckett/Marlowe: Two playwrights representing two of the hottest contemporary name styles, double-t names and hidden-o names.
Zoe/Eve: These Greek and Hebrew “life” names look similar on paper, but not spoken aloud.
Rima/Amir : These mirror-image Arabic name make a smooth, trim pairing.
Laurel/Daphne : Daphne is the Greek form of Laurel. Both names are thoroughly familiar, but neither has ever been common.
Tristan/Gavin: Two Knights of the Round Table, but far less conspicuous than Lancelot and Galahad.
Indigo/Sienna: Straight from your local Crayola 64-pack, these color names share a creative spirit.
And many more. Also this comment:
My inner scientist has always wanted twin girls named Ethyl and Lauryl as both names are chemistry terms.