| Name | Role | Place | Source | |
|---|---|---|---|---|
| Aletta M. Key | Travelers | 1916 | Rotterdam | Passenger registers |
| Christina M. Key | Registered | 1839 | Maurik | Population register |
| Eduard M. Mc. Key | Travelers | 1911 | Rotterdam | Passenger registers |
| Emma M' Key | Registered | Antwerpen | Foreigners register | |
| M. Key | Travelers | 1931 | Rotterdam | Passenger registers |
| M. Key | Travelers | 1957 | Rotterdam | Passenger registers |
| M. Key | Registered | Soest | Officiersboekjes | |
| Violet M. Key | Travelers | 1936 | New York | Passenger registers |
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