Rider sits next to 4 phonetic neighbors — Ryder, Tyler, and Riker are the closest matches by sound. Most share Rider's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"one who rides, horse rider"
"lover of churches, bright-headed"
"from the island of Cyprus"
"spring-like, of the spring"
"from the third settlement"
"modern creative compound: Ke- + Andre"
"playful one"
"storehouse, place of abundance (from silo)"
"lake colony, settlement by the pool"
"capricious, whimsical (related to Latin capra, goat)"
"homestead on the rock"
"hedged enclosure"
"from the Frankish haigro (heron)"
"from Dreux (ancient French city name)"
"peaceful, tranquil"
"grace, favor, thankfulness"
"enthusiastic speech, advice"
"eager enthusiasm"
"battle settlement"
"beloved of Yahweh"
"like life force, vibrant"
Similar sound: These names share phonetic patterns with Rider — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Rider.
Rhythm: Rider is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.