Marcelo sits next to 4 phonetic neighbors — Marcel, Marco, and Marcellus are the closest matches by sound. Most share Marcelo's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of Mars, dedicated to Mars"
"light, illumination"
"Free man, Frenchman"
"army man, soldier"
"of the bean growers (Fabii clan)"
"Jehovah is generous"
"mind, spirit, heart"
"river"
"the greatest"
"lover of horses"
"foundation stone"
"famous ruler"
"new house"
"God is with us"
"lion-like, brave"
"gift of God, gift of Yahweh"
"youthful, downy-bearded"
"Frenchman"
"farmer; earth worker; tiller of the soil"
"of Mars, warlike"
Similar sound: These names share phonetic patterns with Marcelo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin (Marcus/Mars) origins, giving them the same cultural heritage as Marcelo.
Rhythm: Marcelo is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.