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"
"vigilant in war, son of Cathasach"
"son of Japheth, ancestor of Greeks"
"beloved of God, beloved of Yahweh"
"island meadow"
"Gods flame"
"short form of -dino names, little warrior"
"to thrive, to succeed, prosperous"
"speckled, variegated"
"bard, poet (from Irish Daimhin)"
"little warrior"
"God is gracious (from Shawn/Sean)"
"path, narrow lane"
"step, stride"
"shining with glory"
"lean, slender warrior"
"rope maker"
"made of gold, radiant"
"wolf-like, fierce hunter"
"concluding musical passage"
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.