Coriander vs Cilantro

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As a person who has had my own gardens and houseplants since I was a child gardening with my grandpa and my mom, raising houseplants with my mom, etc, I have never heard of any plant having the seed called one thing and the actual plant called something else. Have you? Actually, I never heard of either coriander or cilantro until after I married a man from India and started learning how to cook Indian foods. In India, it only has one name, coriander, whether seed or plant. I can remember going to a regular American local grocery store looking for coriander leaves, like parsley. When we found it, we found out it was called cilantro and had no idea that it had this other name. In America, when you ask for coriander, you only get the seed, either whole or ground. If you want coriander leaf, you have to ask for cilantro. Even when chefs are making Mexican food, they call it cilantro. So, how did this plant get two different names? Are there other plants whose seeds are called one thing while the plant is called something else? Why did this happen to coriander? Why is parsley the same whether seed or plant?