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"
"content, satisfied"
"honor (via Nora/Honora root)"
"golden-yellow color"
"princess, noble lady"
"ugly head (archaic literal meaning)"
"beloved/wished-for child"
"dove"
"eternal life, vitality"
"fame, renown"
"precious gem from the sea"
"spirit of battle"
"peaceful, safe"
"mighty, powerful"
"Marian devotion + floral beauty"
"noble birth, people of high social standing"
"little street, alley"
"moral and spiritual purity"
"Lord have mercy (prayer refrain)"
"royal meadow, kingapos;s clearing"
"dweller in the valley"
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.