Indy sits next to 4 phonetic neighbors — Indie, Andy, and Sandy are the closest matches by sound. Most share Indy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"short for Indiana (land of Indians)"
"pale, holy"
"will and fame"
"modern invented American name"
"pebbly place, bald clearing"
"gift of Yahweh"
"of the Chiel family"
"atmospheric mist, haze"
"tile-maker (via Tyler root)"
"dark one, little dark one"
"large homestead"
"pointed mountain, hill"
"white, fair-complexioned"
"God is gracious"
"warrior, battle"
"famous spear (from Hrodgar)"
"from Sweden, soft napped leather"
"flowing water, river"
"unbranded cattle; one who refuses to conform"
"friend of Yahweh"
"divine power, God's rule"
Similar sound: These names share phonetic patterns with Indy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have American origins, giving them the same cultural heritage as Indy.
Rhythm: Indy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.