Codeword coincidence

A favourite pastime of mine is doing codeword puzzles,on average I do about three a day,and I,ve been doing them for over a year now,I estimate in that time I,ve done over a thousand. Never before in a puzzle have I come across the word "Zirconium", guess what I have now ,twice in one day,one in a puzzle in a paper,the other in a puzzle book I bought,ages ago,I mention this just to exclude the possibility that news paper editors may have colluded, in producing the same word in their daily codewords. This word is,nt exactly a common word,so what are the odds of this happening ? .As of now I havent found any great personal significance in this,perhaps I,ll find a zirconium ring.