American Battle Monuments Commission (ABMC)

A visit to the American Battle Monuments Commission website will reveal that the commission was "established in 1923 by Congress at the request of General John J. Pershing to honor the accomplisments of the American Armed Forces...".

Essentially, it is a government website where visitors can search for loved ones who lost their lives while serving the country during the Mexican War, Civil War, Spanish-American War, WW1, WW2, Korea and Vietnam, and are buried in American Military cemeteries overseas.

A quick search of the WW1 database revealed the following:

Coffee, Robert L., Private, US Army, 128th Inf. Regt., 32d Inf Div., Entered the service from West Virginia, died Nov. 10, 1918, buried at Plot F, Row 38, Grave 9, Meuse-Argonne American Cemetery, Romagne, France

Coffey, Ed M., Private, US Army, 128th Inf. Regt., 32d Inf. Div., Entered the service from Colorado, died Oct. 12, 1918, missing in action or buried at sea, name included on Tablets of the Missing at Meuse-Argonne American Cemetery, Romagne, France

Coffey, Francis W., Private, US Army, 101st Inf. Regt., 26th Inf. Div., Entered the service from Massachusetts, died Sep. 13, 1918, buried at Plot E, Row 20, Grave 19, Meuse-Argonne American Cemetery, Romagne, France

Coffey, James E., Private, US Army, 103d Inf. Regt., 26th Inf. Div., Entered the service from New Hampshire, died May 10, 1918, buried at Plot C, Row 24, Grave 2, St. Mihiel American Cemetery, Thiaucourt, France

Coffey, Joseph E., Private, US Army, 16th Inf. Regt., 1st Inf. Div., Entered the service from Pennsylvania, died Oct. 8, 1918, buried at Plot B, Row 25, Grave 12, Meuse-Argonne American Cemetery, Romagne, France

Coffey, Lewis, Private, US Army, 804th Pioneer Inf. Regt., Entered the service from Alabama, died Mar. 20, 1919, buried at Plot D, Row 7, Grave 33, St. Mihiel American Cemetery, Thiaucourt, France

For WW2 and later click on the above link, then select "World War II", then about half way down in the lead paragraph, click on "World War II database." Enter any surname, click on the search button, and results are returned quickly.