| Name | Role | Place | Source | |
|---|---|---|---|---|
| C. G. Key | Registered | 1849 | Leiden | |
| C. Key | Travelers | 1961 | New York | Passenger registers |
| C. Key | Travelers | 1959 | New York | Passenger registers |
| C. Key | Travelers | 1962 | Rotterdam | Passenger registers |
| C. de Key | Military | Studbooks | ||
| Gerritje Adriana C. Key De Wit | Arrestant | 1943 | Leerdam | Institutional Registers |
| June C. Key | Travelers | 1955 | New York | Passenger registers |
| Mary C. Key | Travelers | 1910 | Rotterdam | Passenger registers |
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