Londyn sits next to 4 phonetic neighbors — London, Landen, and Lyndon are the closest matches by sound. Most share Londyn's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright, shining light"
"season, year"
"black, the dark one"
"blooming flower, radiance"
"God is my oath"
"wood, forest"
"gift from God"
"broken land"
"star"
"high, exalted"
"diminutive of Harriet (home ruler)"
"from the crooked stream"
"lioness of God"
"sea circle, sea chief"
"gracious, dear, beloved"
"hare's meadow, hare clearing"
"oak tree clearing"
"flowering, blooming"
"smiley, cheerful (derived from nickname)"
Similar sound: These names share phonetic patterns with Londyn — similar vowel sounds, consonant clusters, or rhythm.
Rhythm: Londyn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.