Hawm was a large male bull seal of the Western Sea. His actual first name is unknown, but it is gathered that he is a "Hawm"; or, in the seal language, a great leader of his people.
According to Grath Longfletch, the longer one extends the 'A' in "Hawm", the more respectful the title is.
Hawm claimed to be the king of a large iceberg on which Grath Longfletch, Martin II, Clecky, Plogg, Welko, and Viola Bankvole were marooned. Recognizing that the crew was lost and that Grath was an otter, Hawm took the group to Holt Rudderwake, where his otter friend Wallyum Rudderwake reigned. After the party decided to leave for Sampetra Island, Hawm and his seals towed their logboat. Fearing for the safety of his younger clan members in the dangerous area of Sampetra, Hawm led his seals away from the island as soon as Martin's crew reached it; however, he later returned in company with several full-grown sealfolk to attack the corsairs, thus saving the lives of Welko and Viola, who were being pursued by the pirates.
Later, in gratitute for his actions, Hawm was presented with Ublaz Mad Eyes' crown by Abbot Durral and Martin II. He and his tribe then guided the Redwallers' new ship Seaking, which had been named in his honor, back to the shores of Mossflower Country.