Spencer sits next to 4 phonetic neighbors — Hunter, Carter, and Parker are the closest matches by sound. Most share Spencer's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dispenser of provisions, household steward"
"servant, messenger"
"modern coined name"
"Frankish person"
"alert, watchful, vigilant"
"settlement near the coal"
"battle"
"noble, illustrious"
"lion-like, brave"
"ruler of the people"
"from the valley town"
"lover of churches"
"famous warrior"
"sovereign, owner"
"leatherworker, craftsman"
"thunder god"
"little fire"
"counsel's guardian"
"fearless, not cowardly"
"mill worker, grain grinder"
"Yahweh has strengthened"
Similar sound: These names share phonetic patterns with Spencer — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French origins, giving them the same cultural heritage as Spencer.
Rhythm: Spencer is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.