I had no idea, but here’s what I found when I looked it up:
the plant’s well-known common name, Hen and Chicks, was derived from the new plants that mature Echeveria will produce. The mature plant, the hen, develops numerous offsets, chicks, which surround the mature plant until the offsets are mature enough to support themselves.
WrookieSchU 
here it’s a part of what we call ‘hens and chicks’ in a succulent garden
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Oh wow that’s interesting. I wonder why they’re called that.
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I had no idea, but here’s what I found when I looked it up:
the plant’s well-known common name, Hen and Chicks, was derived from the new plants that mature Echeveria will produce. The mature plant, the hen, develops numerous offsets, chicks, which surround the mature plant until the offsets are mature enough to support themselves.
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Oh wow that is really fascinating and makes me want to have one haha. Thank you Beth!
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