Xia in Chinese is written 夏 (summer), 霞 (the glow of sunrise or sunset clouds), or 厦 (a large building). The summer character is also the name of the legendary Xia dynasty, traditionally the first Chinese dynasty.
Xia is used as a Chinese girls' name particularly in southern China. The pinyin romanization Xia represents a sound (something like "shee-ah") that English speakers often find tricky — but the meanings are radiant.
Xia does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
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In Pythagorean numerology the letters of Xia reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.