Blue sits next to 3 phonetic neighbors — Lou, Drew, and Bleu are the closest matches by sound. Most share Blue's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the color blue, sky and sea"
"the tree of enlightenment"
"path, narrow lane"
"friend of warriors"
"modern invented name"
"Dack's settlement"
"little king, royal"
"iron"
"peace"
"hilltop settlement of the friend"
"cross, the cross of Christ"
"enlightened rice (kanji: 悟飯)"
"unconquerable, unbreakable"
"variant of Devon: from the Devon region"
"belonging to the Tiber (sacred river of Rome)"
"western meadow, western clearing"
"remnants of a lake, driftwood"
"high, enlightened"
"helping stone, memorial stone"
"honoring God"
"free man"
Similar sound: These names share phonetic patterns with Blue — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French/Germanic origins, giving them the same cultural heritage as Blue.
Rhythm: Blue is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.