This is the 1348th most frequent Japanese word.
やよい
"やよい" (Yayoi) refers to the third month of the Japanese lunar calendar or can be used as a feminine given name.
やよい is used here as a proper name.
やよいは桜を見に行きました。
Yayoi went to see the cherry blossoms.
弥生 refers to a historical period in Japan.
弥生時代は日本史の一部です。
The Yayoi period is a part of Japanese history.
弥生 indicates early spring, named after the month in the traditional calendar.