Suna sits next to 3 phonetic neighbors — Luna, Sona, and Lina are the closest matches by sound. Most share Suna's Turkish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"teal duck, garganey waterfowl"
"short form of longer Welsh names"
"God is gracious (from Juana/Juanita lineage)"
"birthday of the Lord, born at Christmas"
"Twin; one born with another"
"bright, radiant"
"Beloved; good (Hebrew diminutive related to Tov meaning good)"
"most holy, very pure"
"prosperous, lively (creative blend of Aqua and Aisha)"
"truthful one"
"night, dark beauty"
"blessed with goodness"
"American invented name; possibly related to Tamara (date palm) via ..."
Similar sound: These names share phonetic patterns with Suna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Turkish origins, giving them the same cultural heritage as Suna.
Rhythm: Suna is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.