Colby

• Same eraCampbellLike Colby, it was given most in the 2000s.#617 · rising
• Same rhythmAriSame beat as Colby: two syllables, stress on the first, ending on a vowel sound, but it starts differently.#614 · falling
• ShorterAnneOne syllable to Colby's two, so you can tell them apart when you call both.#619 · steady
• LongerAriyaThree syllables to Colby's two: a long name beside a short one keeps them distinct.#614 · steady
• RiskyColbieSounds just like Colby, spelled differently. Two kids, one name.#881 · 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.