Annabeth sits next to 3 phonetic neighbors — Anna, Elizabeth, and Annabelle are the closest matches by sound. Most share Annabeth's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pledged to God"
"grace combined with woodland clearing"
"female monarch, sovereign ruler"
"God is my oath"
"princess, noble lady"
"strong, manly (via Andrew from Greek Andreas)"
"princess, noblewoman"
"modern invented name, victory lake"
"eastern lands"
"gift, generous"
"ornament, adornment"
"separated, consecrated"
"noble grace"
"Scot + lake/waterfall"
"descendant of the dark-eyed"
"illusion, water"
"God has heard"
"esteemed, beloved"
"daughter of the mountain"
"feminine form of Charles/Karl"
"settlement by the stream"
Similar sound: These names share phonetic patterns with Annabeth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Annabeth.
Rhythm: Annabeth is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.