Blythe sits next to 4 phonetic neighbors — Blight, Bliss, and Lythe are the closest matches by sound. Most share Blythe's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"happy, carefree, joyous"
"called forth, gloriously summoned"
"servant of St. Fillan"
"famous ruler"
"Honor"
"hare's meadow, hare clearing"
"sun, moon"
"flat piece, thin layer"
"God will establish; may God protect"
"son of the fair one"
"beloved, desired"
"bright fame"
"powerful counsel"
"resolute protector, will-helmet"
"princess, noblewoman"
Similar sound: These names share phonetic patterns with Blythe — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English blithe origins, giving them the same cultural heritage as Blythe.
Rhythm: Blythe is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.