Blu sits next to 4 phonetic neighbors — Blue, Bleu, and Boo are the closest matches by sound. Most share Blu's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the color blue"
"ascent, going up"
"crooked nose, winding river bend"
"speckled meadow, brixton clearing"
"golden, made of gold"
"slender, graceful"
"God has favored me"
"one who works with stone"
"moon (from Roman goddess Luna)"
"royalty, noble one from the heavens"
"reborn, born again"
"Quinn's meadow, meadow of the chief"
"from the royal city"
"successful, one who attains her goals"
"famous warrior"
"helmeted, noble protection"
"essence of blessings, pure blessing"
"little one who God shepherds"
"quaking aspen meadow"
"river of milk (original Greek)"
"little Natalia, sweet Christmas child"
Similar sound: These names share phonetic patterns with Blu — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Italian/English origins, giving them the same cultural heritage as Blu.
Rhythm: Blu is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.