<<<It's not uncommon. The Dutch for "nothing" is
<niets> [nits] (accidentally very close to the Polish for "nothing",
<nic> [n^its]), but is commonly pronounced as [nIks].<<<
In Dutch, "niets" and "niks" are two different words in Dutch, the former
is "niet+s", the latter a loan from German.
Vriendelijke groetjes,
Frank