Savanna sits next to 4 phonetic neighbors — Savannah, Savana, and Shavanna are the closest matches by sound. Most share Savanna's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"flat tropical grassland"
"modern American creation"
"rose + gentle (folk etymology)"
"descendant of Cathasach"
"eagle valley"
"noble, of noble kind"
"manifestation of God"
"whole, universal (Emma) + lake/beautiful (lyn)"
"ash tree pool"
"downy-bearded, youthful"
"grace, favor"
"faithful, loyal, genuine"
"elevated place, great one"
"modern invented name"
"to strive, to rival, to excel"
"genuine, authentic, faithful, loyal"
"water nymph, spring"
"grace (via resemblance to gracia)"
"member of the Gauts tribe"
"forest, woodland"
"captivating, snare"
Similar sound: These names share phonetic patterns with Savanna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Taíno via Spanish origins, giving them the same cultural heritage as Savanna.
Rhythm: Savanna is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.