• 永久えいきゅう — permanent / everlasting
• 久ひさしぶり — after a long time
• 久ひさしい — long time (has passed)
• 久々ひさびさ — for the first time in a while
• 久保くぼ — common surname

久 is an ancient character that represents “a long period of time.” It originates from the image of stretching or pulling. In cursive script, it resembles the shape of “く,” and is considered one of the roots of the hiragana character.

久ひさしぶりに 友人ゆうじんに 会あいました。
I met my friend for the first time in a long while.

永久えいきゅうに 続つづく 愛あいを 信しんじたい。
I want to believe in eternal love.