Sandino sits next to 4 phonetic neighbors — Sandro, Santino, and Sandino are the closest matches by sound. Most share Sandino's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of men; little saint"
"nickname name (Thai given name)"
"eagle warrior"
"character, virtuous disposition"
"son of Jack, God is gracious"
"meadow of the holly tree"
"all, completely"
"one of the Vandal people"
"river crossing dweller"
"elevated, lofty"
"the solar deity"
"exclamation of wonder, surprise, or realization"
"western land, western meadow"
"Calm; composed; dignified; of great weight and gravitas"
"God"
Similar sound: These names share phonetic patterns with Sandino — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Spanish/Italian origins, giving them the same cultural heritage as Sandino.
Rhythm: Sandino is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.