What does it mean when you have a window saying there is another user and your computer has been renamed

When i opened my computer this morning, a window was there saying that there was a second user using my computer and had changed the name ... what does the mean?

ok, thanks Grant Bennet-Alder ..  so this could have been my phone or my ipad I assume.
even though i have not seen this before, and had had all three for a couple of years now . but, maybe if I understand this right, my iphone could have been using wifi instead of cellular? 
Is this what you mean?
again, thank you so much.
Melissa

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