Theodorus sits next to 4 phonetic neighbors — Theodore, Theodoric, and Theodosius are the closest matches by sound. Most share Theodorus's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"gift of God"
"God is salvation"
"beauty, charm"
"bringer of treasure (of the Magi)"
"forest ranger, game warden"
"gift of healing"
"Athenian, of Attic culture"
"Sunday child"
"all + holy (pan + agios)"
"one who covers"
"from Nazareth, consecrated to God"
"little one"
"lord, have mercy (liturgical)"
"greatest (superlative of great)"
"follower of the god of wine and festivity"
"of Arcadia, from the pastoral paradise"
Similar sound: These names share phonetic patterns with Theodorus — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Ancient Greek origins, giving them the same cultural heritage as Theodorus.
Rhythm: Theodorus is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.