Millar sits next to 3 phonetic neighbors — Miller, Milla, and Millie are the closest matches by sound. Most share Millar's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"one who grinds grain, miller"
"overflowing plenty, great fullness"
"the number six"
"beautiful, fair"
"lord, mistress (variant of Kyra)"
"wild rose of the people"
"liberation, blowing out"
"one who brews ale or beer"
Similar sound: These names share phonetic patterns with Millar — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English/Scottish origins, giving them the same cultural heritage as Millar.
Rhythm: Millar is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.