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"
"rigid airship (named for Count Ferdinand von Zeppelin)"
"cedar tree, resinous wood"
"bright, splendid"
"son of the firebrand"
"beloved, dear one"
"thatcher, roof builder"
"mourning (symbolic)"
"eternal, immortal"
"man of power on the hill"
"craftsman of fermented beverages"
"one who has made pilgrimage to the Holy Land"
"without wax, pure"
"from the marshy plain"
"peaceful ruler"
"summit, top"
"grey hill, army hill"
"son of Carr, marshy land"
"noisy disturbance, civil commotion"
"dragon, serpent"
"yellow-haired, blonde"
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.