|"Harry, your eyesight really is awful."
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Ballcocke is an alternate spelling of the English surname Balcock, which derives from the diminutive suffix -cock combined with either Bald, a pet form of the Germanic male given name Baldwin, or the Old English beald ("brave," "bold").
A ballcock is a mechanism for filling water tanks (such as in flush toilets) designed to prevent overflow and backflow.
Behind the scenes
- This character was presumably named after Alastair Bullock, the assistant art director on the film adaptation of Harry Potter and the Prisoner of Azkaban.
- Harry Potter and the Prisoner of Azkaban (film) (Appears on Marauder's Map)