Within the North @-@ western Pacific Ocean , both the Japan Meteorological Agency ( JMA ) and the Philippine Atmospheric , Geophysical and Astronomical Services Administration assign names to tropical cyclones that develop in the Western Pacific , which can result in a tropical cyclone having two names . The Japan Meteorological Agency 's RSMC Tokyo — Typhoon Center assigns international names to tropical cyclones on behalf of the World Meteorological Organization 's Typhoon Committee , should they be judged to have 10 @-@ minute sustained windspeeds of 65 km / h , ( 40 mph ) . While the Philippine Atmospheric , Geophysical and Astronomical Services Administration assigns names to tropical cyclones which move into or form as a tropical depression in their area of responsibility located between 135 ° E and 115 ° E and between 5 ° N @-@ 25 ° N even if the cyclone has had an international name assigned to it . The names of significant tropical cyclones are retired , by both PAGASA and the Typhoon Committee . Should the list of names for the Philippine region be exhausted then names will be taken from an auxiliary list of which the first ten are published each season . Unused names are marked in gray .