This is the 10274th most frequent Japanese word.
靖彦
"靖彦" (Yasuhiko) is a Japanese given name, where "靖" means "peaceful" or "calm," and "彦" means "boy" or "young man."
In this sentence, "靖彦" is used as a proper noun — a name of an individual.
靖彦さんは親切な人です。
Mr. Yasuhiro is a kind person.
Here, "靖彦" is referred to specifically as a name, commenting on its rarity.
靖彦という名前は珍しいですね。
The name Yasuhiro is uncommon, isn't it?
Again, "靖彦" is serving as the proper noun indicating the friend's name.