WTF does your name mean?

[Cuchulainn]

BRENNAN
Usage: Irish, English
From an Irish surname derived from Ó Braonáin meaning "descendent of Braonán". Braonán is a given name meaning "sorrow" (Irish braon "tear drop" and a diminutive suffix).

I can't find Speyrer anywhere on google, though

Speyrer German (Bavaria): habitational name for someone from Speyer on the Rhine
perhaps also Jewish, as the original form of Shapiro.