Arlo sits next to 4 phonetic neighbors — Harlow, Marlo, and Carlo are the closest matches by sound. Most share Arlo's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"fortified hill"
"full of goodness"
"gracious, merciful"
"red king, famous ruler"
"occupational name for an archer or bowman"
"little fire"
"people's king"
"messenger of God, divine messenger"
"God is gracious"
"great, venerable, majestic"
"God will uplift, exalt"
"twin"
"strong as a boar"
"fair-haired hero; white warrior"
"descendant of the ruler of the home"
"the victorious, the conqueror"
"advice, counsel"
"young dog, whelp"
"son of Carr (marsh dweller)"
"mythical bird of rebirth"
Similar sound: These names share phonetic patterns with Arlo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Arlo.
Rhythm: Arlo is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.