Blue sits next to 3 phonetic neighbors — Blu, Bleu, and Blythe 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"
"peaceful, gentle"
"lyric, of or relating to the lyre, suitable for singing"
"noble, of noble kind"
"sunny place, facing the sun"
"guarded by God"
"victorious, triumphant (via Jay)"
"dream, vision, aspiration"
"goddess"
"luminaries, lights (plural)"
"love, beloved"
"modern tribute name"
"nobility, of noble descent"
"wise, a wise person"
"journey, travel, life path"
"of the Livius clan"
"tree"
"thunder goddess, feminine form of Tyr"
"coined name, aspirational"
"follower of Christ, anointed"
"rhythm, musical flow, falling"
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.