Kooper

• Same eraLangstonLike Kooper, it was given most in the 2010s.#999 · falling
• Same rhythmMacklinSame beat as Kooper: two syllables, stress on the first, ending on a consonant, but it starts differently.#998 · steady
• ShorterLevOne syllable to Kooper's two, so you can tell them apart when you call both.#999 · steady
• LongerEphraimThree syllables to Kooper's two: a long name beside a short one keeps them distinct.#988 · steady
• RiskyCooperSounds just like Kooper, spelled differently. Two kids, one name.#27 · rising

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.