Alanna sits next to 3 phonetic neighbors — Alana, Lanna, and Elena are the closest matches by sound. Most share Alanna's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little child; dear child (endearment)"
"light"
"diminutive of Harriet (home ruler)"
"each of the two"
"modern blended form"
"lion of God"
"brave, strong"
"poppy flower"
"child of light, precious gem"
"noble, nobility"
"the winter season"
"most holy"
"a day's travel, voyage"
"bay laurel"
"grace and lake"
"pearl"
"sweet one, related to honey"
"loved, valued"
"joyful, happy"
"the royal/divine one (lani = heaven/royalty)"
"white hero"
Similar sound: These names share phonetic patterns with Alanna — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Alanna.
Rhythm: Alanna is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.