• 旧姓きゅうせい — former surname
• 旧友きゅうゆう — old friend
• 旧式きゅうしき — old style
• 旧館きゅうかん — old building
• 旧家きゅうか — old family (lineage)
• 旧正月きゅうしょうがつ — Lunar New Year

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The character 旧 is a combination of 日ひ (sun, day) and a phonetic element representing a container or boundary. It originally referred to something from the past or something that is no longer in active use. The concept of “former” or “long ago” is key.

旧友きゅうゆうに 再会さいかいしました。
I reunited with an old friend.

旧姓きゅうせいを 使つかっています。
I still use my former surname.