Buck sits next to 4 phonetic neighbors — Duck, Tuck, and Chuck are the closest matches by sound. Most share Buck's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"male deer, strong young man"
"wise one (from Sionann mythology)"
"son of Paye/Pace (son of Peace)"
"surname used as first name"
"God is gracious (from Shawn/Sean)"
"heart"
"eastern town"
"chess castle piece"
"Patrick's town, fighter's settlement"
"God has given"
"step, stride"
"the Christian cross"
"place at the bow-shaped hill"
"nobleman, earl"
"cold, enduring"
"descendant of the shouter (herald)"
"variant of Jason (healer) or Jacob (supplanter)"
"powerful, bright-headed warrior"
"modern invented name"
"of divine origin"
Similar sound: These names share phonetic patterns with Buck — 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 Buck.
Rhythm: Buck is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.