What is the name of Carl's late wife in Up?

Carl's late wife in Up is named Ellie.

Ellie first appears as a child who shares Carl Fredricksen's fascination with the explorer Charles Muntz. She dreams of visiting Paradise Falls in South America and keeps a scrapbook for recording adventures. Carl and Ellie eventually marry, renovate the abandoned house that served as her childhood clubhouse, and build their life together there.

The film's opening montage follows their marriage across decades, showing ordinary happiness as well as painful setbacks. They work, save money for a trip to Paradise Falls, and repeatedly spend those savings on urgent household needs. After learning that they cannot have children, they continue planning a shared adventure. Ellie becomes ill before they can make the journey and dies after giving Carl her scrapbook.

Her memory drives much of Carl's behavior. He fills the house with balloons and flies it toward Paradise Falls partly to fulfill Ellie's dream, but the journey gradually teaches him that honoring her does not require remaining trapped in the past. Ellie is sometimes confused with another Pixar character because she has limited screen time, but her relationship with Carl is the emotional foundation of Up.