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"
"modern variant; to heal (via Jason/Jace connection)"
"supplanter, God will establish"
"defender of men"
"people, folk (from Old High German diot, related to Dietrich)"
"pure, unblemished"
"to wash, purify"
"tested by time, enduring"
"God is good"
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.