| Spekker, Adriana Cornelia | Spekker Uko Müller | 1901 | |
| Spekker, Heinrich Bernhard Johann | 1921 | ||
| Spekker, Maria Adriana Swanette | Spekker Uko Müller | 1902 | |
| Spekker, Peter Joh.es Gerardus | Spekker Uko Müller | 1898 | |
| Spekker, Petronella Maria Charlotte | 1920 | ||
| Spekker, Uko Müller | 1901 |