Marty sits next to 4 phonetic neighbors — Marty, Barty, and Hardy are the closest matches by sound. Most share Marty's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of Mars, warlike"
"thank you, grateful"
"thankful"
"one who works with stone"
"rider, horseman, mounted warrior"
"grandfather"
"moon, moonlit"
"strong lord, chief"
"possibly derived from Kevin (gentle birth)"
"Olympic victor"
"champion"
"dark, dark-featured"
"nautical term for reducing sail area"
"three, third-born"
"improvement, change for the better"
"victory of the people"
"winner, victorious fighter"
"eastern town"
"son of Rhys, son of the ardent one"
"son of Piers (Peter)"
"rescuer, redeemer"
Similar sound: These names share phonetic patterns with Marty — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin Martinus origins, giving them the same cultural heritage as Marty.
Rhythm: Marty is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.