Lehman sits next to 3 phonetic neighbors — Layman, Lemon, and Leeman are the closest matches by sound. Most share Lehman's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Leaseholder; tenant farmer"
"he who holds firm the good"
"gracious defender (if related to Desmond)"
"from the burial mound"
"descendant of the champion"
"to tame, subdue"
"ruler of the people"
"lord of the right path"
"work-power, home-ruler"
"God will uplift"
Similar sound: These names share phonetic patterns with Lehman — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have German origins, giving them the same cultural heritage as Lehman.
Rhythm: Lehman is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.