To be honest with you, if you want a VERY good representation of some of the major clan's family trees from 1550-1600, check out Nobunaga's Ambition: Rise to Power, it has lifespans and information on over 600 figures from the time period.

Also, in the Azai genealogy, the two sons of Nagamasa, Manpukumaru and Manjumaru, are just childhood names. Had they lived to see adulthood, they more probably than not would have names involving the "Masa" character.

If anyone has any questions about anything in the period, feel free to contact me, I'm very interested in it, and am always looking up new information about it.