Helen Armstrong's 4 syllables (2 + 2) hit the Hollywood sweet spot.
Helen's 2 beats vs. Armstrong's 2 create a natural cinematic snap.
Helen Armstrong's softer consonants cost it screen presence.
Helen Armstrong misses the alliteration hook that makes names stick.
Helen (5 letters) and Armstrong (9) have a slight length mismatch, but it reads fine on screen.
Helen Armstrong has mostly familiar phonemes with a few tricky patterns.
Helen Armstrong's open vowels roll off the tongue — warm and screen-ready.