Betty Nansen's 4 syllables (2 + 2) hit the Hollywood sweet spot.
Betty's 2 beats vs. Nansen's 2 create a natural cinematic snap.
Betty Nansen's softer consonants cost it screen presence.
Betty Nansen misses the alliteration hook that makes names stick.
Betty (5 letters) and Nansen (6) are balanced in length — clean on any poster or marquee.
Betty Nansen's sounds flow naturally in English — easy to say and remember.
Betty Nansen has decent vowel richness, but stronger A and O sounds would lift it.