No single person invented the internet. The US military started it, but scientists Vint Cerf and Bob Kahn created the rules connecting today's networks.
The internet was not invented by one person. Many people contributed in varied manner to make the internet what it is today. For example: Packet Switching (1960s), a concept developed by Paul Baran and Donald Davies, and U.S. Department of Defence developed Defense's Advanced Research Projects Agency (ARPA).
Hey! The internet wasn't invented by just one person. But the real "fathers of the internet" are Vint Cerf and Bob Kahn, who created the TCP/IP rules in the 1970s that let all those computers finally talk to each other!