Chad sits next to 5 phonetic neighbors — Brad, Thad, and Tad are the closest matches by sound. Most share Chad's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"warrior, battle"
"rapid water"
"descent, gentle"
"green river, fresh water"
"man from Sebastia"
"row of trees by the wood"
"church official, ecclesiastical law"
"handsome, beautiful"
"rowan tree"
"crooked hill; bent (cam) nose (sron)"
"sky, heavens"
"modern American creation"
"surname derived from topographic ridge"
"settlement by the pool"
"power of peace"
"steep valley settlement"
"dear, beloved"
"son of Otto, helpful"
"pledged, devoted"
Similar sound: These names share phonetic patterns with Chad — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English/Brythonic origins, giving them the same cultural heritage as Chad.
Rhythm: Chad is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.