Gabriel Wilhemus Manek (Lay Tjong Sie) (1913 – 30 November 1989) was an Indonesian archbishop of the Roman Catholic Church who was born in Ailomea Lahurus and died in Saint Joseph Hospital (Denver, Colorado).
Gabriel Wilhemus Manek was born on August 18, 1913, in Ailomea, Lahurus, Timor island.
He was the youngest son of the couple John Leki (Lay Phiang Sioe) and Lioe Kioe Moy.
Baptized one day after his birth which is on August 19, 1913, under the name: Gabriel John Wilhelmus Manek by Arnold Verstraelen.
On 16 October 1932 he entered the Novitiate SVD and since 17 January 1937 lectured at the seminary high Ledalero, and graduated force.