The Nikkei stock index briefly climbed over 2 percent early Monday after Wall street gains late last week and a weaker yen against the U.S. dollar boosted exporters following stronger-than-expected U.S. jobs data. At 9:15 a.m., the 225-issue Nikkei Stock Average was up 719.53 points, or 1.86 percent, from Friday at 39,355.15. The broader Topix index was up 38.48 points, or 1.43 percent, at 2,732.55. On the top-tier Prime Market, gainers included insurance, bank and electric appliance issues. The U.S. dollar hit around 149.10 yen early Monday, its highest level since mid-August, as solid U.S. e…