When Ellen Søltoft Groot was born on 30 March 1894, her father, Ejner Groot, was 31 and her mother, Jakobine Soltoft, was 25. She lived in København, Denmark for about 10 years.
Some characteristic forenames: Dutch Hendrik, Pieter, Willem.
Dutch: variant, without the definite article de ‘the’, of De Groot , a nickname for a big man, from groot ‘great, large’. Compare Grote .
North German: variant of Groth , a cognate of 1 above.