Jan

• Same eraNancyLike Jan, it was given most in the 1950s.#965 · steady
• Same rhythmScoutSame beat as Jan: one syllable, ending on a consonant, but it starts differently.#995 · steady
• LongerHenleyTwo syllables to Jan's one: a long name beside a short one keeps them distinct.#1,000 · falling
• RiskyJaneOne letter away from Jan. You'll call the wrong one for years.#221 · 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.