Luther sits next to 3 phonetic neighbors — Luca, Luther, and Tucker are the closest matches by sound. Most share Luther's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"famous army, warrior people"
"set apart, destined"
"servant of God"
"brave bear, strong as a bear"
"brave"
"estate dweller"
"shelter, protection"
"from Radley (red clearing)"
"from the place of wide waters"
"no one equals God"
"creative elaboration of Finn"
"alive, vital"
"modern coined name, variant of Kyson"
"supplanter, one who replaces another"
"God has remembered"
"son of the ridge dweller"
"green river, fresh water"
"from the heath"
"continuous improvement (kaizen-inspired)"
"dreamy obscurity"
"deep gorge, ravine"
Similar sound: These names share phonetic patterns with Luther — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German origins, giving them the same cultural heritage as Luther.
Rhythm: Luther is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.