Kiritimati's commonly used English name is Christmas Island.
Kiritimati is an atoll in the Pacific Ocean belonging to Kiribati. Its name is the Kiribati rendering of “Christmas,” reflecting the island's sighting by Europeans on Christmas Day in 1777. It is not the same place as Australia's Christmas Island in the Indian Ocean, an important geographic distinction.
Kiritimati lies in the world's UTC+14 time zone, the most advanced civil time zone currently in use. Because of that position, settlements on the island are among the first inhabited places to reach midnight on January 1. News reports often describe it as one of the first places to welcome the New Year, although the exact wording depends on whether the comparison concerns inhabited locations, islands, or national territory.
Easter Island, Cocos Island, and Norfolk Island are separate places with different locations and political affiliations. The alternate name “Christmas Island” is therefore the specific answer, while Kiritimati is the official local name used in Kiribati.