Sprague sits next to 4 phonetic neighbors — Drake, Blaine, and Gage are the closest matches by sound. Most share Sprague's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Alert; lively; quick"
"lavender plant, purple flowering herb"
"defender of men"
"God is good"
"white, fair, bright"
"supplanter, God will establish"
"tested by time, enduring"
"people, folk (from Old High German diot, related to Dietrich)"
"modern variant; to heal (via Jason/Jace connection)"
Similar sound: These names share phonetic patterns with Sprague — 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 Sprague.
Rhythm: Sprague is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.