This is the 7169th most frequent Japanese word.
一久
"一久" (Ikkyuu) is a Japanese given name meaning "one eternity" or "lasting one."
In this sentence, '一久' is used as a proper noun, specifically as someone's name.
昨日、一久さんと駅で会いました。
Yesterday, I met Mr. Ikkyuu at the station.
Here, '一久' represents a fictional name given to a character in a story, emphasizing its usage as a name.
この物語の主人公は、一久という名前の少年でした。
The protagonist of this story was a boy named Ikkyuu.
In this sentence, '一久' is directly addressed to someone, showing its usage as a personal name.