What is the name of Mr. Krabs' daughter?

Mr. Krabs’s daughter is named Pearl Krabs.

Pearl is a teenage sperm whale who lives with her father, Eugene “Mr.” Krabs, in a hollow anchor-shaped home. Her enormous size compared with the smaller residents of Bikini Bottom is a recurring visual joke: she can shake buildings when she jumps and fill spaces with tears when she cries. She is voiced by Lori Alan.

Pearl’s personality differs sharply from her father’s. She is interested in school, friends, fashion, shopping, and fitting in with her whale peers, while Mr. Krabs is famously focused on money and business. She sometimes helps at the Krusty Krab, but she does not want to make the family restaurant her full-time job while she is still in high school. In the series and related material, she is expected to inherit the restaurant when she is older.

The show has never fully explained why a crab and a whale have a daughter. Supplemental material has suggested that Pearl’s mother was a whale, but the series deliberately keeps that family history mysterious. Pearl is therefore the canonical answer even though her unusual species is an intentional running mystery.