The paternal grandfather of the baby is called Charles-Antoine. While the previous head of the de Ligne's was Prince Antoine (13th P. de Ligne). The 5th prince was also an Antoine.
Anothr Antoine -still only baron de Ligne- was head of the family in the 16th century. He had the nickname 'Great Devil" for his fierceness on the battlefield. As Emperor Charles V refused to award him the Golden Fleece, he started his own parody order: the order of the Wolf.
The other names do not run in the family as much. Neither do they appear frequently in the la Tremouïlle or Croÿ-Roeulx families (though the father of the newborn has a cousin who is called Hadrien).
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Apparently Tau is a name used in Southern Africa, which means "lion". Several rulers of Rolong (territory in present-day Botswana) were named Tau.