Indigo sits next to 3 phonetic neighbors — Indio, Iggy, and Diego are the closest matches by sound. Most share Indigo's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"blue-purple dye, the color indigo"
"courageous, valiant"
"the Nubian, the southerner"
"reputation, esteem"
"throne"
"invented name; light or replica"
"modern coined name, variant of Kyson"
"wolf"
"from the pool or marsh"
"courage, bravery"
"bright, clear, famous"
"he to whom it belongs, messianic title"
"raven's island"
"savior"
"from the town, settlement"
"he who resembles God (rhetorical)"
"impulsive, little king"
"son of Gilbert, son of Gib"
"the greatest"
"sky, heavens"
"army guard, protecting warrior"
Similar sound: These names share phonetic patterns with Indigo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via Latin origins, giving them the same cultural heritage as Indigo.
Rhythm: Indigo is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.