Indigo sits next to 4 phonetic neighbors — Indiana, Indira, and Indy 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
"deep blue-purple color, from India"
"life, living"
"bright, shining one"
"elf ruler with feminine suffix"
"moon goddess"
"hollow, cauldron"
"divine messenger"
"bright, shining one"
"nocturnal, daughter of the night"
"summer"
"my God is an oath, pledged to God"
"violet flower, purple"
"bright fame, shining fame"
"of the lily, lily-like"
"high, noble (Ali) + grace (Anna)"
"queen"
"musical harmony, pleasant sound"
"youthful, downy-bearded"
"chalk wharf, chalk port"
"cassia tree, cinnamon spice"
"olive"
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 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.