Diego sits next to 3 phonetic neighbors — Iago, Tiago, and Diago are the closest matches by sound. Most share Diego's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"beloved, may God protect"
"steadfast, firm"
"one who carries Christ in heart"
"Saint James"
"Priceless; of inestimable worth"
"God will increase"
"gift of Yahweh"
"brave, lion-hearted"
"youthful, downy-bearded"
"Twin"
"from Lucania (ancient region of Italy)"
"eager, industrious"
"gift of God"
"savior"
"Yahweh is God"
"rival, eager to excel"
"gift of God"
"people's champion, victorious"
"born on Sunday"
"farmer; earth worker; tiller of the soil"
Similar sound: These names share phonetic patterns with Diego — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew via Latin origins, giving them the same cultural heritage as Diego.
Rhythm: Diego is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.