Clydia sits next to 4 phonetic neighbors — Lydia, Claudia, and Clydie are the closest matches by sound. Most share Clydia's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the River Clyde (strong current)"
"noble, distinguished, illustrious"
"daughter of darkness"
"courageous, spirited"
"Dark river"
"rough; short one"
"a jewel-bright, exotic feminine name"
"from Florence, Italy"
"land of the south wind"
"elf friend"
"Hardworking, industrious; prosperous"
Similar sound: These names share phonetic patterns with Clydia — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Celtic Clota origins, giving them the same cultural heritage as Clydia.
Rhythm: Clydia is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.