Blu sits next to 4 phonetic neighbors — Blue, Bleu, and Beau 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, sky"
"healer"
"son of Ay, moon's son (via Turkish)"
"fighter, battle"
"the people"
"little joy"
"associated with Al-Khidr, the immortal guide"
"prince, ruler"
"courteous, well-bred, polite"
"friend, companion"
"gracious, dear one"
"Kent dale, valley settlement"
"consecrated, majestic"
"geographic name from ancient Gaulish"
"son of the gray-haired one"
"he will enlighten"
"noble bear"
"warrior (via Irish Kane)"
"to carry, to endure"
"one who tills the land, farmer"
Similar sound: These names share phonetic patterns with Blu — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French 'bleu' via Germanic 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.