In November 2007 Radcliffe published several poems under the pen name Jacob Gershon – a combination of his middle name and the Jewish version of his mother 's maiden name Gresham – in Rubbish , an underground fashion magazine . He has a close friendship with his Harry Potter co @-@ stars Tom Felton and Emma Watson , and is tight @-@ knit with his family , whom he credits for keeping him grounded .