Robert

• Same eraCalvinLike Robert, it was given most in the 1950s.#132 · steady
• Same rhythmChristianSame beat as Robert: two syllables, stress on the first, ending on a consonant, but it starts differently.#96 · falling
• ShorterKaiOne syllable to Robert's two, so you can tell them apart when you call both.#93 · steady
• LongerJonathanThree syllables to Robert's two: a long name beside a short one keeps them distinct.#89 · falling
• RiskyRobertoOne letter away from Robert. You'll call the wrong one for years.#569 · falling

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.