A 400 year plus tradition was broken recently in the Oda family. Mr. Oda Nobutaka, the 18th head of the Oda clan did not name his sons "Nobu." He was quoted as saying, "People easily detect I have the Oda bloodline because of the name. I hated it." Here is the link to the article: http://news.livedoor.com/article/detail/9473172/
Kind of sad to see tradition go away, but I know "Nobu" will be used again in the near future.