Elspeth sits next to 3 phonetic neighbors — Elizabeth, Elspet, and Elsbeth are the closest matches by sound. Most share Elspeth's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pledged to God, God is my oath"
"from Sebaste, revered, venerable"
"full of life, vibrant"
"precious, beautiful"
"lake, pool"
"of noble birth"
"tortoise, ancient clan"
"snare, one who captivates (metaphorical)"
"son of Matthew, gift of God"
"beloved, dear"
"The other Aenor (foreign)"
"noble, exalted + strength, power"
"noblewoman, lady"
"judged by God, under divine judgment"
"hermitage meadow, woodland clearing"
"protector"
"she of the lake"
"element in Yoruba compound names meaning blessed/noble"
"gazelle"
Similar sound: These names share phonetic patterns with Elspeth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew (via Scottish) origins, giving them the same cultural heritage as Elspeth.
Rhythm: Elspeth is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.