Nechtan was the son of Gwyddno Garanhir de Strathclyde and Irb de Strathclyde. The date and place of his birth have not been found.
His wife is not known. They were married, but the date and place have not been found. Their only known child was Beli I (?-<0641).
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | FROM 0594 TO 0641 | roi des Pictes |