Lu sits next to 3 phonetic neighbors — Lou, Lew, and Hugh are the closest matches by sound. Most share Lu's Chinese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"land, road, prosperity"
"God is gracious"
"happy, fortunate, blessed"
"work and power"
"equal, level, balanced"
"dweller at the wood"
"one who grows in virtue"
"valley dweller"
"Valley of the linden trees"
Similar sound: These names share phonetic patterns with Lu — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Chinese origins, giving them the same cultural heritage as Lu.
Rhythm: Lu is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.