My Kenyan is a little rusty, but I believe it's something along the lines of "staunhuallan". ;)
IIRC, the Sheriff said to forget the BC. So they must have found something else. The mothers passport shows he lost citizenship. What they may find is a statement by Barak, that he became a citizen around 1970. He may have documented it when applying for a drivers license or passport. There may be a record of immigration of a boy named Soebarkah, from 1970. He may have arrived with an Indonesian passport. These things get recorded in multiple databases and paper.