What is the Polish word for Matthew?

Answer 1

It's Mateusz.

Sometimes people consider also "Maciej" (diminutive: "Maciek") to be an equivalent of this name, but in fact it is the equivalent of Mathias.

It is because both "Mateusz" and "Maciej" (Mathew and Mathias) stem form the same Hebrew name "Maithayahu" - but they were split in The Bible (New Testament): Matthew was the apostle who wrote the first Gospel, Mathias was the 13th apostle, chosen instead of Judas.

In Poland, Maciej is a far mor frequent name than Mateusz, ist seems - contrary to their English equivalents.

Answer 2

The Polish word for Matthew is "Mateusz."