Berg sits next to 3 phonetic neighbors — Burke, Bjorg, and Borg are the closest matches by sound. Most share Berg's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"mountain, hill"
"river of the moon, great stream"
"modern variant of Tyrell (surname used as given name)"
"narrow river"
"place at the bridge on the Bann"
"mountain"
"Settlement by the rocks"
"The wren bird; small, spirited songbird"
Similar sound: These names share phonetic patterns with Berg — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Berg.
Rhythm: Berg is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.