Henley sits next to 3 phonetic neighbors — Bentley, Hadley, and Finley are the closest matches by sound. Most share Henley's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the high woodland clearing"
"descendant of the black-haired one"
"modern invented American name"
"God will save"
"one who catches fish"
"champion, cloud"
"lasting, enduring"
"rowan tree"
"modern blend name, ray of light"
"dear, beloved"
"young wolf"
"ruler of supernatural beings"
"son of Ed, son of the wealthy guardian"
"royal power, bold ruler (via Kendrick)"
"from the brae (hillside) + lin (pool)"
"beauty, ornament"
"overseer, tenant farmer"
"darling, beloved"
"nonconformist, free spirit"
"lion"
Similar sound: These names share phonetic patterns with Henley — 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 Henley.
Rhythm: Henley is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.