Lou sits next to 4 phonetic neighbors — Drew, Blue, and Stu are the closest matches by sound. Most share Lou's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"famous warrior"
"to hunt, to chase"
"those who are friendly"
"of the forest, wood dweller (via Silas)"
"supplanter, one who follows at the heel"
"beauty, grace"
"short form nickname"
"glory and spear (hrod + gar)"
"sky"
"sea hill"
"elf counsel, wise counselor"
"little fire"
"watchful"
"Lord, have mercy (liturgical)"
"atmospheric mist, haze"
"beauty, adornment, grace"
"slender one, the thin one"
"steep valley settlement"
"righteous, just"
"the immortal self"
"flowing, running"
Similar sound: These names share phonetic patterns with Lou — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic via French Louis origins, giving them the same cultural heritage as Lou.
Rhythm: Lou is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.