Jill Day may refer to:
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A given name and surname combination. Without further context, "Jill Day" is simply a proper noun. It could refer to a specific individual or could be a name used in fiction.
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Potentially, a term that could be used in a regional or specific community context, although no widespread meaning is currently known. If the term has a specific meaning within a particular community, more information regarding that community is needed to define it properly. This use is speculative and requires additional evidence.
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Possible character name in literature, film, or other creative works. Due to the lack of broader context, it is not possible to confirm if it is a recognized character name.