Roberth sits next to 3 phonetic neighbors — Robert, Roberto, and Rupert are the closest matches by sound. Most share Roberth's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright fame"
"victor's crown"
"well-pleasing, excellent"
"of the vine, wine merchant"
"dear little one, devotee"
"blind"
"God has given"
"God will increase, God will add (José)"
"God with us, divine presence"
"Gods gift"
"resolute protector"
"treasure of God"
"defender of the people"
"victorious (if related to Cairo)"
"Yahweh saves"
"God strengthens"
"who is like God?"
"from the Basque people or region"
Similar sound: These names share phonetic patterns with Roberth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German origins, giving them the same cultural heritage as Roberth.
Rhythm: Roberth is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.