This is the 3393rd most frequent Japanese word.
武部
"武部" (Takebe) is a Japanese surname meaning "martial section" or "military division."
In this sentence, '武部' is used as a proper noun, likely a surname.
武部さんは忙しいです。
Mr. Takebe is busy.
Here, '武部' refers to a proper noun, possibly the name of a town or location, as part of '武部町'.
武部町は静かな町です。
Takebe Town is a quiet town.
In this example, '武部' denotes a location where the individual resided.