Margo

• Same eraRockyLike Margo, it was given most in the 1950s.#568 · rising
• Same rhythmZakaiSame beat as Margo: two syllables, stress on the first, ending on a vowel sound, but it starts differently.#563 · rising
• ShorterSaulOne syllable to Margo's two, so you can tell them apart when you call both.#557 · steady
• LongerArielThree syllables to Margo's two: a long name beside a short one keeps them distinct.#558 · steady
• RiskyMarcoOne letter away from Margo. You'll call the wrong one for years.#370 · steady

Suggestions come from names in this year's top 1,000. Rhythm and rhyme are judged from each name's pronunciation (Wiktionary's, or espeak's reading of the spelling), so a few calls may be off.