Jim Carrey's 3 syllables (1 + 2) hit the Hollywood sweet spot.
Jim's 1 beat vs. Carrey's 2 create a natural cinematic snap.
Jim Carrey's softer consonants cost it screen presence.
Jim Carrey misses the alliteration hook that makes names stick.
Jim (3 letters) and Carrey (6) have a slight length mismatch, but it reads fine on screen.
Jim Carrey's uncommon phonemes make it harder for audiences to latch on.
Jim Carrey has decent vowel richness, but stronger A and O sounds would lift it.