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"
"journey, day's travel"
"sea (via Kai)"
"white, beautiful"
"one who sails, seafarer"
"royal greatness, grandeur"
"land of the Welsh, Wales"
"word, speech"
"whole, universal"
"desert, wilderness"
"pure"
"wool"
"God is gracious (from Juana/Joanna)"
"work, industriousness"
"jade, precious green stone"
"beautiful"
"a precious green gemstone prized for protection and luck"
"hare's woodland clearing (via Harley)"
"grace, favor"
"laurel, victory"
"from the elder tree grove"
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.