Robby sits next to 4 phonetic neighbors — Bobby, Robb, and Rocky are the closest matches by sound. Most share Robby's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright fame"
"resolute will, helmet of will"
"unique modern American name"
"anointed one"
"son of Cole; charcoal-dark"
"resolute protector, determined guardian"
"energy, spirit, vigor"
"dark settlement"
"light, illumination"
"smooth, soft leather (suede)"
"fidelity, eternity"
"valley dweller"
"noble, distinguished"
"the number seven"
"strength"
"sea, ocean (from the Kai element)"
"his peace"
"page boy (de Chiel)"
"church, monastic cell"
"God is gracious"
"modern coinage inspired by Zion (holy place)"
Similar sound: These names share phonetic patterns with Robby — 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 Robby.
Rhythm: Robby is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.