What’s in a name…that makes it popular to one generation, and downright ugly to the next? From “Bertha” and “Layla” to “Reagan” and “Katrina,” history shows us that politics, pop songs and news events all play roles in sending baby names skyrocketing or plunging in the rankings. Mo (short for “Maurice”!) returns to his elementary school to speak with his fifth-grade teacher about his own name, then talks to Columbia University linguist John McWhorter and actor Todd Bridges about other names that have seen better days.