Frances Gumm's 2 syllables sit just outside the ideal 3–5 range.
Frances's 1 beat vs. Gumm's 1 create a natural cinematic snap.
Frances Gumm's softer consonants cost it screen presence.
Frances Gumm misses the alliteration hook that makes names stick.
Frances (7 letters) and Gumm (4) have a slight length mismatch, but it reads fine on screen.
Frances Gumm has mostly familiar phonemes with a few tricky patterns.
Frances Gumm has decent vowel richness, but stronger A and O sounds would lift it.