<Tr> <Td> </Td> <Td> 269,063 </Td> <Td> </Td> <Td> − 9.9% </Td> </Tr> <Tr> <Td> 2000 </Td> <Td> 256,231 </Td> <Td> </Td> <Td> − 4.8% </Td> </Tr> <Tr> <Td> </Td> <Td> 597,337 </Td> <Td> </Td> <Td> 133.1% </Td> </Tr> <Tr> <Td> Est. 2017 </Td> <Td> 621,349 </Td> <Td> </Td> <Td> 4.0% </Td> </Tr>

What is the origin of the toponym of louisville