This is the 10113th most frequent Japanese word.
邦博
"邦博" is a Japanese given name, typically masculine, with no inherent dictionary meaning as it depends on the kanji interpretation chosen by the namer.
In this sentence, 邦博 (Kunihiro) is used as a proper noun—a male given name—identifying the person who is engaged in the activity of studying Japanese.
邦博さんは日本語を勉強しています。
Mr. Kunihiro is studying Japanese.
Here, 邦博 (Kunihiro) refers to the name itself, discussing its frequency and cultural presence in Japan.
邦博という名前は日本でよく使われます。
The name Kunihiro is commonly used in Japan.
In this case, 邦博 (Kunihiro) represents an individual whose research was the subject of a lecture, highlighting a possessive context.