Berth sits next to 4 phonetic neighbors — Bertha, Beth, and Berta are the closest matches by sound. Most share Berth's Germanic cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"famous"
"dark-complexioned warrior"
"the bitter one"
"famous, shining"
"variant of Geraldine"
"victory of the people"
"he will laugh, he will rejoice"
"lame (from Latin claudus)"
"settlement in the valley, valley town"
Similar sound: These names share phonetic patterns with Berth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Berth.
Rhythm: Berth is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.