Mo sits next to 4 phonetic neighbors — Joe, Bo, and Row are the closest matches by sound. Most share Mo's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the praised one"
"dweller at the Roman camp"
"narrow channel, strait"
"the greatest"
"counsel meadow"
"God ruler; one who rules with divine authority"
"little fire"
"of noble kind"
"God is gracious"
"village at the ford; river-crossing settlement"
"son of William"
Similar sound: These names share phonetic patterns with Mo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Mo.
Rhythm: Mo is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.