Analysis of information sources in references of the Wikipedia article "பிந்துலு" in Tamil language version.
The name "Bintulu" is, in fact, derived from the Malay "Menta Ulau" – "the place for gathering heads"; before Bintulu was bought by Charles Brooke from the Sultan of Brunei in 1853, Melanau pirates preyed on the local coast, attacking passing ships and decapitating their crews.
The fort built at Bintulu was called Fort Keppel, after the first Rajah's old friend