Bastion sits next to 4 phonetic neighbors — Sebastian, Bastian, and Fabian are the closest matches by sound. Most share Bastion's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"venerable, worthy of reverence"
"white hawk or modern creation"
"counsel power, wise advisor"
"variant of Cassius, ancient Roman gens name"
"place of glamour and royalty (associative)"
"flood tide, abundance"
"from the stone settlement"
"from Arles (city in France)"
"battle spirit"
"alive, full of life"
"independent"
"thankful, God has heard"
"strong and enduring as oak wood"
"king, lord"
"rising, ascending"
"deep valley dweller"
"son of Roger, famous spear"
"may God smile"
"great lord"
Similar sound: These names share phonetic patterns with Bastion — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Bastion.
Rhythm: Bastion is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.