Calum

• Same eraKaisenLike Calum, it was given most in the 2020s.#800 · rising
• Same rhythmRaylanSame beat as Calum: two syllables, stress on the first, ending on a consonant, but it starts differently.#800 · falling
• ShorterKeithOne syllable to Calum's two, so you can tell them apart when you call both.#800 · falling
• LongerEverestThree syllables to Calum's two: a long name beside a short one keeps them distinct.#796 · steady
• RiskyCallumSounds just like Calum, spelled differently. Two kids, one name.#118 · 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.