Robbie sits next to 3 phonetic neighbors — Bobby, Robby, and Robin are the closest matches by sound. Most share Robbie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright fame"
"oak tree"
"intelligent, wise"
"modern invented elaboration of Ezra"
"champion (Irish-inspired)"
"son of Japheth, ancestor of Greeks"
"son of a nobleman (variant interpretation)"
"universe, cosmos"
"God is gracious"
"lake of the sage Kashyapa (Sanskrit etymology)"
"hero, brave warrior"
"modern invented name"
"fragrant spice, sweet bark"
"island meadow"
"possible Japanese aesthetic: figure, image"
"modern invented name"
"archer, bow-wielder"
"fair, fair-haired, white"
"warrior"
"lover of the earth"
Similar sound: These names share phonetic patterns with Robbie — 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 Robbie.
Rhythm: Robbie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.