Within the UK and Ireland, the surname Jansen most frequently occurs in England where it is carried by 1 in 41,375 people. The majority of those with the family name of Jansen are to be found living in/around Greater London (approx. 33% of all UK Jansen's), West Midlands and Essex. The name can also be found in Scotland with 1 in 54,300 people using it, and Ireland with 1 in 84,737.
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