Younger Simpson sister

ASHLEE

Think of the Simpson sibling whose name sounds like a tree but isn’t Lisa.

This clue refers to Ashlee Simpson, the younger sister of pop star Jessica Simpson. The name plays on the well-known Simpson family from pop culture, but in this case, it’s about the real-life Simpson sisters rather than the animated TV show. The answer is straightforward—just her first name, spelled "ASHLEE," with the double "E" at the end.