Montgomery sits next to 4 phonetic neighbors — Gomery, Montgomery, and Monty are the closest matches by sound. Most share Montgomery's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Gomeric's mountain or hill"
"festive occasion, day of rest"
"noble, excellent"
"meadow, clearing"
"graceful meadow"
"God is gracious"
"full of goodness"
"gleaming one"
"noble kind, noble born"
"sun, throne"
"broad meadow (constructed meaning)"
"beautiful"
"flag, banner"
"story, tale, narrative"
"from Berlin; swamp, marsh (Slavic root of Berlin)"
"ceremonial attendant"
"little Frances"
"elf friend"
"modern invented name combining Zay and Lynn"
"all-heavenly, completely divine"
"well-born, noble"
Similar sound: These names share phonetic patterns with Montgomery — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Norman French origins, giving them the same cultural heritage as Montgomery.
Rhythm: Montgomery is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.