Bonanza sits next to 3 phonetic neighbors — Bonnie, Anza, and Benanza are the closest matches by sound. Most share Bonanza's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"prosperity, fair weather, rich ore vein"
"tough, masculine, rugged"
"priceless, inestimable"
"exquisitely beautiful, charming"
"work ruler, powerful one"
"will, desire, divine purpose"
"short form of Elizabeth"
"little fort dweller"
"entry, means of approach"
"One who operates a press; press forward with urgency"
Similar sound: These names share phonetic patterns with Bonanza — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Spanish origins, giving them the same cultural heritage as Bonanza.
Rhythm: Bonanza is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.