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