Not an official name.

Buried in the McBride cemetery:
Harstad, Sig   1896 – 1979
Harstad, Eva May   1914 – 1996
Harstad, Leon S.   1944 – 2008
Harstad, Robert A.   1949 – 1993
Harstad, Sheena Maree   1969 – 1970

There is an entry for Mount Sig Harstad in the Cebuano Wikipedia, where we find that “The land around Mount Sig Harstad is mostly mountainous, but immediately surrounding it are hills. The highest point in the vicinity has an elevation of 2,816 meters and is 2.6 km south of Mount Sig Harstad. Less than 2 people per square kilometer around Mount Sig Harstad. The nearest larger town is McBride, 19.4 km north of Mount Sig Harstad. The area around Mount Sig Harstad is almost completely covered in grass.”

There is also a Mount Sig Harstad page on Geonames.