Spencer Tracy's 4 syllables (2 + 2) hit the Hollywood sweet spot.
Spencer's 2 beats vs. Tracy's 2 create a natural cinematic snap.
Spencer Tracy's softer consonants cost it screen presence.
Spencer Tracy misses the alliteration hook that makes names stick.
Spencer (7 letters) and Tracy (5) are balanced in length — clean on any poster or marquee.
Spencer Tracy has mostly familiar phonemes with a few tricky patterns.
Spencer Tracy has decent vowel richness, but stronger A and O sounds would lift it.