The naming strictly follows gtk+ naming, with '_' replaced by '-'. As an example gtk_widget_show_all becomes gtk-widget-show-all. gtk+ names are so long that I think they will never collide with other names.
Hmm. In such a case I doubt that lazy importing would hurt badly, since the names already unlikely to collide (not never - someone might make a Great Transformer Kollider library involving midgets, except they misspelled it as widgets (dyslexia's a bummer for programming you know, it's hard to see the difference between i and ! sometimes)); think of it as "cdar", which isn't in arc yet but which pg is too lazy to add "just for completeness".
