I don't know about its relative rarity compared to other countries, but it's entirely possible in Japan for a husband to take his wife's family name. Typically it's done for a economic (marrying into a better-off family) or lineage (bringing a male heir into a family without one) reasons. I'm 100% guessing that marriage is what happened here though, just want to make that clear.
The blog is a group blog with many authors and the handle of the person who made that post is にゃぁ. I don't think the title is any evidence that Chika Sekigawa is involved with the blog because minna no chikara just means "the strength of everyone" or "combined strength."
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