The overall number of foreigners who became naturalised Germans grew 20% in 2021, reaching roughly 131,600, the Federal Statistical Office said. Of those, 19,100 were Syrians who became German citizens.

Hundreds of thousands of migrants entered Germany after former Chancellor Angela Merkel opened the borders in 2015 to refugees fleeing war and poverty in the Middle East and beyond.

While, in general, a person has to live in Germany for at least eight years to qualify for citizenship, the majority of Syrians qualified earlier - on average after 6.5 years - by showing particular willingness to integrate, for example with strong language skills and civic commitment, it said.

The office said 2021 saw the highest number to date of people who naturalised early, with just under 12,400 cases. Of those, 43% were Syrian.

The number of Syrians who naturalise is expected to also rise in 2022. At the start of the year, 449,000 Syrian nationals had been in Germany at least six years, more than four times as many as at the start of 2021, the office added.