I think you can get his birth certificate here
https://www.wiewaswie.nl/en/search/search-results/record-details/a2apersonid/324877846/srcid/2582403/oid/4"Hendrikus Johannes (Jan) Huijgen, born on August 17, 1888 in Rotterdam, son of Petrus Arnoldus Huijgen and Johanna Catharina Jetten, departed before the Second World War abroad. He was a member of the Rotterdam athletics Pro Patria and took in 1908 as fast walker at the Olympic Games in London."
"WieWasWie (WhoWasWho) is the official website for Dutch civil registration records. It is the most comprehensive genealogical database in the Netherlands, containing births, marriages and deaths from 1811, as well as some Military Registers, Church records(pre 1811), and Family Notices in newspapers. Archives in all the provinces participate in this website to publish indexes and sometimes even scans of their records. More than 104 million names have been indexed as of February 2015"
