Wizards, Witches and Beings: U
Ubbly, Dr. 
Presumably the creator of Dr. Ubbly's Oblivious Unction, a topical treatment for scars. The Unction was prescribed to Ron by Madam Pomfrey to heal the welts left by the brain that attacked him in the Department of Mysteries (OP38).
Ugga 
(1100s)
Quidditch Beater on a twelfth-century Yorkshire team who wasn't quick enough with his club, resulting in Radulf taking a "Blooder" to the head (QA3)
Umbridge,
Dolores Jane 
Ministry witch, Special Assistant to the Minister
of Magic.
Taught Defence Against the Dark
Arts and gradually took over Hogwarts, first becoming Hogwarts High
Inquisitor and eventually becoming Headmistress. (More...)
"dolor" = Latin for pain, sadness, grief, resentment.
"umbrage" = offense, from Latin "umbra" shade, shadow,
ghost.
Umfraville, Quintius 
Wrote The Noble Sport of Warlocks in 1620 (QA6).
"uncle" For any character known only as "uncle [given name]," please look the character up by his given name.
Uric the Oddball 
(medieval, dates unknown)
A medieval wizard famous for his weirdness, who once convinced himself he was a ghost, wore a jellyfish for a hat, and at one point listened to Fwooper song for three months straight (FB, fw). Despite seemingly never doing anything of importance, though, he was covered in first-years’ History of Magic classes (PS8). For more details about Uric's strange life, purchase a copy of Fantastic Beasts and Where to Find Them.
'Uric' means of or relating to urine, and could be a phonetic joke on the name 'Yorick',' from Shakespeare's play "Hamlet." Rowling's "Wizard of the Month" for September 2004 (JKR).
Urquhart 
Slytherin,
1990s
Interestingly Urquhart captained the Slytherin Quidditch team during Harry’s sixth year despite never having been previously mentioned as a player (HBP14).
Urquhart is the name of a castle located along Loch Ness in Scotland.
