Dylana sits next to 4 phonetic neighbors — Dylan, Dylana, and Ilana are the closest matches by sound. Most share Dylana's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Great tide or great wave of the sea"
"clever, prosperous"
"cassia tree, spice"
"Variant of Tiana; possibly from Tatiana (fairy queen) or a diminuti..."
"tastelessly showy"
"third, threefold"
"invented name with musical -qua suffix"
Similar sound: These names share phonetic patterns with Dylana — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Dylana.
Rhythm: Dylana is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.