Charley sits next to 5 phonetic neighbors — Charlie, Harley, and Barley are the closest matches by sound. Most share Charley's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"free man, strong man"
"safe, unharmed (proposed etymology)"
"wild garlic island"
"peace"
"crooked hill; bent (cam) nose (sron)"
"hard spear (from Welsh Peredur)"
"God is my strength"
"to tame, subdue"
"a day's travel, expedition"
"flowing water, river"
"noble and peaceful"
"from the steep place"
"old friend"
"payment, redemption (word association)"
"those who are friendly"
"from the raven (place name)"
"powerful natural force"
"capable with a spear"
"from the burnt clearing"
"invented name, possibly faithful or gentle"
"power of peace"
Similar sound: These names share phonetic patterns with Charley — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German (Karl) origins, giving them the same cultural heritage as Charley.
Rhythm: Charley is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.