TOKYO, Oct 17 - Strong exports, especially to Asia, probably boosted Japan's trade surplus in September from the same month a year ago, according to economists polled by . The median forecast from 23 economists was for a 1.20 trillion yen ($10.9 billion) trade surplus, up 14 percent from last September. Exports are likely to have risen 7.4 percent year-on-year and imports probably gained 5.4 percent, they said. "The trade surplus is likely to show a double digit gain for the second month in a row led by an uptrend in exports to Asia," said Koji Takeuchi, senior economist at Mizuho Research Institute who forecast a trade surplus of 1.244 trillion yen. "There will be some impact from the recent rise in the yen, but it will not change the trend," he said. ///