Passion sits next to 3 phonetic neighbors — Cassian, Ration, and Fashion are the closest matches by sound. Most share Passion's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"intense emotion, strong desire"
"Christian, anointed one"
"lyric, of or relating to the lyre, suitable for singing"
"defender of mankind"
"victorious one"
"God has favored me"
"pretty, beautiful, tender"
"light, brilliance"
"my God is an oath"
"little beloved one"
"from Britain; British woman"
"little fire, fiery one"
"from the Brie region of France"
"nickname form of Adelaide, Addison, Adeline"
"precious gems, treasured one"
"blue, indigo"
"victory peace"
"victory of the people"
"raven"
"land of the Germani people"
"God is gracious"
Similar sound: These names share phonetic patterns with Passion — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin passio origins, giving them the same cultural heritage as Passion.
Rhythm: Passion is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.