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In page GWR locomotive numbering and classification:

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A very simple system was adopted, whereby the name (for broad-gauge locomotives) or number of the first locomotive in a class became the classification for all locomotives in that class (e.g. 'Sun Class', '4000 Class'). After the end of the broad gauge, names were applied to principal passenger and mixed-traffic standard-gauge locomotives. These were often based on a single theme, which could also lend its name to describe a class, for example 'Stars', also known as the '4000 Class', whose names included 'North Star', 'Rising Star' etc.