Alys sits next to 5 phonetic neighbors — Alice, Alyse, and Alexis are the closest matches by sound. Most share Alys's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"noble kind, of noble birth"
"Friend; beloved companion (from amica)"
"lake, waterfall"
"little ruler"
"blind, sixth (via Cecilia)"
"great queen, divine queen"
"rocky meadow"
"His gift; place of peace; tranquil (Biblical place name)"
"golden amber jewel and lake"
"God has afflicted"
"noble lady, bread-kneader"
"early, at dawn"
"of noble birth"
"boomerang"
"plum tree (as Chinese surname 李)"
"butterfly (by association with Vanessa genus)"
"murmuring rock (from the Rhine)"
"occupational surname for a craftsman"
"reborn"
Similar sound: These names share phonetic patterns with Alys — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic via Old French origins, giving them the same cultural heritage as Alys.
Rhythm: Alys is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.