Santhiago sits next to 4 phonetic neighbors — Santiago, Tiago, and Diego are the closest matches by sound. Most share Santhiago's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Saint James, contraction of Santo Jacobo"
"far-sighted"
"nobleman, member of the patrician class"
"love of God, God's beloved"
"divine gift"
"eager for battle"
"melody, song (mythological)"
"wise protector"
"At the byres, near the cattle sheds"
"army man, bold traveler"
"very handsome, beautiful"
"messenger of God, divine angel"
"holy name, name of God"
"protector of men"
"one who has renewed life"
"given by Yahweh"
Similar sound: These names share phonetic patterns with Santhiago — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Spanish origins, giving them the same cultural heritage as Santhiago.
Rhythm: Santhiago is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.