Ethel Grandin's 4 syllables (2 + 2) hit the Hollywood sweet spot.
Ethel's 2 beats vs. Grandin's 2 create a natural cinematic snap.
Ethel Grandin's softer consonants cost it screen presence.
Ethel Grandin misses the alliteration hook that makes names stick.
Ethel (5 letters) and Grandin (7) are balanced in length — clean on any poster or marquee.
Ethel Grandin's sounds flow naturally in English — easy to say and remember.
Ethel Grandin has decent vowel richness, but stronger A and O sounds would lift it.