Acer sits next to 4 phonetic neighbors — Ace, Asher, and Ajax are the closest matches by sound. Most share Acer's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"sharp, keen, pointed"
"wise protector"
"hitting the mark, fortunate"
"broad clearing, wide meadow"
"little saint, holy one"
"black-haired, dark one"
"one who delivers goods, agent"
"ancient, enduring"
"trail left in water"
"man of the olive tree"
"Lord, master"
"to heal, to cure"
"my joy, my song"
"narrow strait, channel"
"fern plant (feathery frond)"
"strife, discord"
"village of the Danes"
"gift of Yahweh"
"spear"
Similar sound: These names share phonetic patterns with Acer — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin adjective origins, giving them the same cultural heritage as Acer.
Rhythm: Acer is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.