Nancy sits next to 4 phonetic neighbors — Nanci, Nancie, and Angie are the closest matches by sound. Most share Nancy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"favor, blessedness"
"pretty, beautiful"
"exalted grace"
"moonlight, halo of light"
"from the Isle of Skye"
"Malay peninsula"
"olive"
"of the Claudian clan"
"ivy plant, climbing vine"
"pearl"
"strong clearing"
"to give thanks, thankfulness"
"glowing ember, burning coal remnant"
"mountainous, of the mountains"
"woman of Judea"
"pleasant meadow"
"heaven, the sky"
"birch tree meadow"
"vigilant in battle, watchful warrior"
"the other, foreign (one)"
"independent one"
Similar sound: These names share phonetic patterns with Nancy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Nancy.
Rhythm: Nancy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.