Proper nouns include any named entities, often appearing in title case. These include places and other entities such as organisations and groups. What is the concept of a person's name called?
Wikipedia is worth quoting here.
Thus "Andrew" indicates a named entity and is a proper noun.
Names are always proper nouns, even when you are artificially using them as common nouns in expressions like "some Andrews", "any London" (there is a London in Ontario and the UK).