You probably did not talk with Sweetser Linthicum about the subject of the origin of the name. I have several letters from him on the subject. He used a geneaologist to trace back to Devon County in England and a place called Hemyock. I had some small differences of opinion with him on how localized the name was to that one place, there are Linthicums throughout Devon and several other parts of England. None in Wales that are genuine. I have a letter from Prys Morgan co-author of Welsh Surnames, also saying the name is not Welsh. Thomas Linthicum did every Linthicum who lived after him a disservice with that "gentleman from Wales" line.