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"
"all-powerful"
"his peace"
"defender at the weir or fortress"
"God is my flame"
"God is gracious"
"Yahweh is gracious"
"songbird, free spirit"
"clan name of early Arabian tribes"
"third child or generation"
"creative modern name, possibly God is my help (from Azriel root)"
"follower of Dionysus (god of wine)"
"the void, primordial emptiness"
"lord of the estate"
"griffin-like (legendary creature)"
"cassia, sweet-scented bark"
"from Athens"
"God has uplifted"
"the great river (via Zaire)"
"shearer of woolen cloth, cloth cutter"
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.