Bobby sits next to 4 phonetic neighbors — Robbie, Rob, and Bob are the closest matches by sound. Most share Bobby's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright fame"
"he gave, gift"
"little warrior, young Mars"
"divine protection"
"bounty, kindly, beloved"
"watchful, vigilant (via Casey)"
"treasure, to store (possible Arabic root)"
"beloved (from David)"
"sea"
"free man"
"son of Harry"
"divine might"
"king's meadow, king's clearing"
"from Sebaste"
"ancient, enduring"
"God exists, gift"
"gift"
"Macks settlement"
"light"
"of the Terentius clan"
Similar sound: These names share phonetic patterns with Bobby — 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 Bobby.
Rhythm: Bobby is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.