First Daughter Code Names

Does some agent-slash-poet actually get paid to sit in a dark corner of a cafe and create the list of Secret Service code names? Here's what they've come up with in the past for First Daughters:

Barbara Bush / Turquoise

Jenna Bush / Twinkle

Chelsea Clinton / Energy

Amy Carter / Dynamo

Susan Ford / Peso

Patti Reagan Davis / Ribbon

Here's my question: do they spend time getting to know the First Kids before deciding what to name them? Did Susan like to shop in Mexico? Did Chelsea and Amy run around the White House like maniacs?