Bert sits next to 4 phonetic neighbors — Burt, Bart, and Berta are the closest matches by sound. Most share Bert's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright, famous"
"bright, clear, famous"
"blooming, fresh, green"
"the white, noble one"
"flowing, moving freely"
"variant of Cinda/Cindy"
"fierce in battle"
"pledged to God, God is my oath"
"of Rome, Roman woman"
"worthy of admiration"
"of the Claudian family"
"to soothe, to comfort"
"narcissus flower, sleep-inducing"
"settlement of the Britons"
"horn, strength"
"prosperous friend"
"from Leicester; possibly heavenly"
Similar sound: These names share phonetic patterns with Bert — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Bert.
Rhythm: Bert is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.