The name Theobald is a boy's name of German origin meaning "courageous people". Theobald and discussed in our forums with posts like "Rate the Previous Signature!".
From the experts:
This is one of the least known or used of the Theo names, quite possibly because of its last syllable. In Samuel Butler's 1903 novel The Way of All Flesh, there is a clergyman character named Theobald Pontifex.
You might want to consider the French version Thibault or the Shakespearean Tybalt instead.