Martin sits next to 3 phonetic neighbors — Marvin, Marcus, and Marcel are the closest matches by sound. Most share Martin's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of the king"
"honoring God"
"Yahweh has shown favor"
"from the surname Cauvin"
"From France"
"Poecc's estate; Poecc's settlement"
"of the Sergii clan"
"upright, fair"
"strong, virile"
"animal enclosure, warren"
"God will hear"
"bold counsel"
"God has healed"
"battle"
"little fire"
"famous warrior, renowned fighter"
"priest's town, priestly settlement"
"defender of men"
"elf counsel, supernatural wisdom"
"always powerful"
Similar sound: These names share phonetic patterns with Martin — similar vowel sounds, consonant clusters, or rhythm.
Rhythm: Martin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.