Birth name: Ronald Bilius Weasley.

'Ronald' meaning: Ronald=Old Norse Rögnvaldr: "Having the Gods' Power".

'Bilius' meaning: Bilius=bilious, one of the four Medieval "humors" (temperaments), indicating anger and peevishness. Ron takes his middle name from his Uncle Bilius.

'Weasley' meaning: Weasley=like a weasel? JKR: "In Britain and Ireland the weasel has a bad reputation as an unfortunate, even malevolent, animal. However, since childhood I have had a great fondness for the Family Mustelidae; not so much malignant as maligned, in my opinion".

Other names: Dobby calls him 'Wheezy', Luna calls him 'Ronald' instead of 'Ron', and Lavender Brown calls him 'Won-Won'. Slughorn calls him 'Ralph' and 'Rupert' by mistake.

Ron's copy of Advanced Potion-Making got inscribed 'Roonil Wazlib' when his quill malfunctioned.