Wallace sits next to 3 phonetic neighbors — Wallis, Willis, and Walter are the closest matches by sound. Most share Wallace's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"foreigner, Welshman (Celtic speaker)"
"well-born, of noble birth"
"the fifth-born child"
"son of Cole"
"dream, aspiration, vision"
"courageous heart"
"protector of people"
"heart brave"
"bright fame"
"bright, full of sunshine"
"little raven"
"son of the red warrior"
"wolf"
"supplanter, one who follows"
"army ruler, power of the army"
"Saint Anne"
"son of the army ruler"
"God is my help"
"fire (from the sun god Aodh)"
"slender"
"tournament fighter"
Similar sound: These names share phonetic patterns with Wallace — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French/Norman origins, giving them the same cultural heritage as Wallace.
Rhythm: Wallace is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.