Londynn sits next to 4 phonetic neighbors — London, Londyn, and Lindsay are the closest matches by sound. Most share Londynn's Celtic/Roman (Londinium)-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the great river settlement"
"gate by a lake or moor"
"strong"
"grace, favor"
"famous warrior with brightness"
"watchful, alert"
"gladness, delight"
"one who sails, seafarer"
"protector of men"
"blessed joy, peaceful friend"
"complete and lake-pure"
"voice, sound"
"resurrection, rising again"
"life (Eva root)"
"Christmas, born at Christmas"
"light of God"
"beloved, variant of Maria"
"land of the Welsh, Wales"
"dark one, dark-haired"
"jasmine flower"
Similar sound: These names share phonetic patterns with Londynn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic/Roman (Londinium) origins, giving them the same cultural heritage as Londynn.
Rhythm: Londynn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.