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"
"bitter"
"raven"
"hunter, rising in the sky"
"strength of the spear"
"God is gracious"
"fellow countrymen, compatriots"
"hay meadow, hayfield clearing"
"to ascend (aliyah)"
"little rock, handsome, beautiful"
"guardian, protector"
"heavenly chief"
"rye meadow, rye clearing"
"grace, divine goodwill"
"whole, universal"
"fertile, productive"
"one who inherits, female heir"
"modern invented name, possibly of the forest"
"lyric, of or relating to the lyre, suitable for singing"
"arrogant, haughty"
"woodland clearing (Locc's meadow)"
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.