Berlin sits next to 3 phonetic neighbors — Merlin, Belen, and Darlin are the closest matches by sound. Most share Berlin's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from Berlin (swampy area)"
"God has helped"
"green gemstone"
"little gentle one (variant of Kevin)"
"son of Aodh (fire)"
"shepherd, sheep herder"
"lord, master"
"invented name, possibly from Tariq (morning star)"
"young man"
"sharp, precise, swift (symbolic interpretation)"
"variant of Riley: valiant, courageous"
"pure strength"
"manly, strong"
"the metal copper"
"from the island of Cyprus"
"supplanter"
"one who fights in combat"
"right-handed, skillful"
"pledge, hostage"
"worker in hard materials"
"belonging to the night"
Similar sound: These names share phonetic patterns with Berlin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Slavic berl origins, giving them the same cultural heritage as Berlin.
Rhythm: Berlin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.