Granger sits next to 3 phonetic neighbors — Ranger, Grayson, and Grant are the closest matches by sound. Most share Granger's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"farm steward, granary manager"
"from the marshy plain"
"my God is help"
"born of fire (head of fire)"
"dark settlement (place name)"
"land of purple dye"
"beginning, origin"
"of the Terentius clan"
"man from Hadria"
"helpful one"
"eternal, perpetual"
"charming, wily"
"invented elaboration of Kameron"
"beloved (from David)"
"people's power"
"creative elaboration of Finn"
"the koa (warrior tree)"
"strip-shaped clearing in woodland"
"little seal"
"modern invented name, possibly 'sincere air' or 'great river'"
"winding river"
Similar sound: These names share phonetic patterns with Granger — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French origins, giving them the same cultural heritage as Granger.
Rhythm: Granger is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.