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TASSILO is an old German name with the stress on the first syllable.
It is a diminutive of TASSO, a name of Langobard/Southern German origin.
It probably goes back to Germanic *dedi / dadi, deed. Another possible derivation is *tato, dad.

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Sources:
Rosa und Volker Kohlheim, Das große Vornamenlexikon, DUDEN, Mannheim 2000
Henning Kaufmann, Altdeutsche Personennamen (Ergänzungsband)
Ernst Förstemann, Altdeutsche Personennamen
Winfried Seibicke, Historisches deutsches Wörterbuch