Deborah Kerr's 4 syllables (3 + 1) hit the Hollywood sweet spot.
Deborah and Kerr have a workable rhythm — close to the perfect punch.
Deborah Kerr blends hard and soft consonants — decent presence, some softness.
Deborah Kerr misses the alliteration hook that makes names stick.
Deborah (7 letters) and Kerr (4) have a slight length mismatch, but it reads fine on screen.
Deborah Kerr's uncommon phonemes make it harder for audiences to latch on.
Deborah Kerr's open vowels roll off the tongue — warm and screen-ready.