We do not CURRENTLY operate under English common law, because we have been separated from England since 1776. However, the common law of the early US followed English common law until our own started taking shape. And the meanings of legal terms used in the late 1700s pretty much ALL come from English common law. In the 1780s, there was no legal language apart from English common law.
Our own started taking shape after The Paris Peace Treaty of 1783 was signed.
So, if you insist that we did indeed operate under ENGLISH common law for many many years, please cite the sources which support this. Please tell us when we finally did fully cast off the laws of England to live under the US law?