Marlo sits next to 4 phonetic neighbors — Marlow, Carlo, and Harlow are the closest matches by sound. Most share Marlo's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"remnants of the lake"
"red-haired, little redhead"
"little bear, bear cub"
"jaybird + euphonic suffix"
"swift projectile, arrow"
"one touched by good fortune"
"pierce the valley"
"linden tree hill"
"God is gracious"
"young wolf"
"from the River Irvine"
"dear, beloved"
"gracious defender"
"rim of a shield"
"from Leicester"
"modern coined name, variant of Kyson"
"deer people (from Devon)"
"man, husband (archaic)"
"goddess of the hunt and moon"
"bold, fearless one"
Similar sound: These names share phonetic patterns with Marlo — 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 Marlo.
Rhythm: Marlo is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.