Fiona sits next to 4 phonetic neighbors — Fiora, Nona, and Mona are the closest matches by sound. Most share Fiona's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"fair, white, pure"
"great one, month of May"
"dark red, crimson"
"beautiful, attractive"
"dark-haired, dark"
"hazel wood clearing (interpretive)"
"girl (divine feminine)"
"peaceful, tranquil place"
"God is my strength"
"one who resembles God"
"moon"
"rich cloth dyed red"
"narrow strait, channel"
"great lord, magnificent ruler"
"eagle, noble strength"
"born in winter"
"elf ruler"
"grace, favor"
"son of Maud, mighty in battle"
Similar sound: These names share phonetic patterns with Fiona — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic origins, giving them the same cultural heritage as Fiona.
Rhythm: Fiona is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.