What is the first name of Pete Campbell's wife?

Pete Campbell’s wife is named Trudy. Her full name is Gertrude “Trudy” Campbell, née Vogel.

Trudy is played by Alison Brie and is introduced as Pete’s polished, socially connected wife. She and Pete met while they were in college—Pete attended Dartmouth, while Trudy attended Mount Holyoke—and they married early in the series. Her parents help the couple purchase an apartment on Manhattan’s Park Avenue, reflecting the family’s wealth and social standing.

Trudy’s storyline is closely tied to the Campbells’ difficult efforts to have a child. After fertility problems and disagreements over adoption, she becomes pregnant in the fourth season and gives birth to their daughter, Tammy. Pete also secretly fathers a son with Peggy Olson, a separate fact that can cause confusion when viewers remember Pete’s complicated family life.

Although Pete’s infidelity eventually leads Trudy to separate from him, they reconcile near the end of the series. Trudy agrees to move with Pete and Tammy to Wichita after he receives a job offer there. Thus, “Trudy,” rather than Cynthia, Jane, or Mona, is the canonical first name asked for in the question.