Undoubtedly fixed as of XIIème century, when the children inherit the paternal name, the French patronyms generally claim one of the four headings:

• geographical locality,
• name of trade,
• nickname,
• character of the Writings.

Obviously, JACQUEMET, hypocoristic¹⁾ of JACQUES, the Christian Apostle, belongs to ultimate of the quoted categories. (in Gothic, this name écrivait:Jaqmet, the consonant < Q > being tildée).

As for can the origin of name, act of a pilgrim therefore or returned of Compostelle?