Sigourney Weaver's 5 syllables (3 + 2) hit the Hollywood sweet spot.
Sigourney's 3 beats vs. Weaver's 2 create a natural cinematic snap.
Sigourney Weaver's softer consonants cost it screen presence.
Sigourney Weaver misses the alliteration hook that makes names stick.
Sigourney (9 letters) and Weaver (6) have a slight length mismatch, but it reads fine on screen.
Sigourney Weaver's uncommon phonemes make it harder for audiences to latch on.
Sigourney Weaver has decent vowel richness, but stronger A and O sounds would lift it.