Hermy

From UnknowableWiki

Hermy is the nickname used by Grawp to refer to Hermione Granger. On the girl's first encounter with the giant, Rubeus Hagrid asks the Gryffindor whether it would be a problem to teach his half-brother to call her 'Hermy', since 'Hermione' would be a difficult name for Grawp to remember (OP30).

Even though Hermione is skeptical of the giant's abilities to learn English, Grawp manages to call her Hermy when desperately looking for 'Hagger' in the Forbidden Forest. She is thoroughly surprised (OP33).