Arbor sits next to 4 phonetic neighbors — Arthur, Harbor, and Archer are the closest matches by sound. Most share Arbor's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bower, canopy of branches"
"God is gracious"
"great, venerable"
"lord of the marches, border lord"
"God is gracious (from Hebrew Yochanan via Welsh)"
"from Milan, middle of the plain"
"my God is light"
"little king"
"God exalts"
"king's town"
"bright fame"
"God enlightens"
"destroyer of enemies, world peace"
"symbol of resilience and mourning"
"goodness, benevolence"
"son of Dennis"
"chief, royal descendant"
"descendant of Braonán (moisture/sorrow)"
"belonging to the Lord"
"elf ruler"
"name of God"
Similar sound: These names share phonetic patterns with Arbor — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Arbor.
Rhythm: Arbor is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.