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"
"dweller at the wood"
"growing, increasing, flourishing"
"happy, fortunate, blessed"
"home ruler, powerful ruler"
"equal, level, balanced"
"God is gracious"
"Valley of the linden trees"
"valley dweller"
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.