Stanley sits next to 3 phonetic neighbors — Hanley, Manley, and Brantley are the closest matches by sound. Most share Stanley's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"stony meadow"
"son of the south"
"city of the moon"
"one who lives in a valley"
"from Amiens (France)"
"fifth"
"renowned warrior"
"oak grove, great"
"exalted father"
"divine reward (alternate interpretation)"
"selected, chosen"
"council friend"
"crowned with laurels, victorious"
"slender and fair"
"of the Julian family"
"fisherman"
"joy, happiness"
"great one, straining force"
"cart maker, transporter"
"western settlement"
"short form of Wesley or Weston"
Similar sound: These names share phonetic patterns with Stanley — 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 Stanley.
Rhythm: Stanley is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.