I found Arnold Faust Gebhard Suhr´s birth cert.
He was the illegitimate child of Mathilde Anna Marie Suhr. So her surname was Suhr.
I also found the other child, Henri Fritz Conrad Suhr. born 8 April 1892, died May 1892 in Berlin
He was also the illegitimate child of Mathilde Anna Marie Suhr
I also found the birth certificate of Mathilde Anna Marie Suhr
born 24 Jan 1869 in Berlin
Father: William Suhr,
Mother: Marie Pauline Luise Lücke
Dave