Halley sits next to 4 phonetic neighbors — Haley, Hailey, and Hallie are the closest matches by sound. Most share Halley's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"hay meadow"
"small deer"
"one who cuts"
"tower"
"from Evreux, from the Evreux region"
"joyful celebration, festivity"
"of Mars, warrior (Marius element)"
"fame and glory"
"God is gracious"
"choice, selection, that which is chosen"
"merchant, trader"
"strength"
"fierce, savage"
"clear, bright"
"hunter's woodland"
"home strength, powerful ruler"
"beloved, dear"
"bold, brave"
"Southern American place name as given name"
"young man, boy"
Similar sound: These names share phonetic patterns with Halley — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Halley.
Rhythm: Halley is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.