Mack sits next to 4 phonetic neighbors — Max, Mac, and Jack are the closest matches by sound. Most share Mack's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of"
"rye-field dweller"
"divine judge"
"king, master"
"from Dax, town settlement"
"to heal"
"poet"
"brave advisor"
"king, ruler, monarch"
"modern American coinage, son of Case"
"son of Egan, little fire"
"continuous improvement (via Kaizen)"
"spear strength, brave with the spear"
"sea-born, born of the sea"
"strife, war"
"strength, manly beauty"
"clearing among oaks"
"valiant, brave"
"western clearing"
"title of honor, great one"
"one who cuts cloth, tailor"
Similar sound: These names share phonetic patterns with Mack — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic origins, giving them the same cultural heritage as Mack.
Rhythm: Mack is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.