This airport is now named "Manhattan Regional Airport".  Some maps and websites do still use the older name "Manhattan Municipal Airport", but "Manhattan Regional Airport" is its official name in Federal Aviation Administration notices and in business.

See FAA data on this airport at
https://nfdc.faa.gov/nfdcApps/services/airportLookup/airportDisplay.jsp?airportId=MHK
and also on page 262 of https://www.faa.gov/documentLibrary/media/Order/7350.9_w_Change_1_Loc_Id.pdf
