Marshall sits next to 4 phonetic neighbors — Marshal, Marcus, and Harrison are the closest matches by sound. Most share Marshall's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"keeper of horses, horse servant"
"anointed one"
"son of Hendrik"
"dark warrior"
"cart driver"
"protector of people"
"from Santino (little saint)"
"bold counsel"
"slender, thin"
"great, venerable, majestic"
"one who lives near a riverbank"
"free man, freeholder of land"
"comforted by God"
"little fire"
"pilgrim to Rome; from Rome"
"one who crafts arrows"
"of the gens Lucia (light)"
"strong lord, powerful chief"
"Greek transliteration of Hebrew Toviyah"
"Yahweh remembers"
Similar sound: These names share phonetic patterns with Marshall — 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 Marshall.
Rhythm: Marshall is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.