SISU is a name for Boy's that means
"Finnish sisu = 'energy, stoic determination, bravery, resilience, perseverance, hardiness' "
It originates from
Finnish
and is a widely used and common name.
More info
Name : SISU
Name Meaning :
"Finnish sisu = 'energy, stoic determination, bravery, resilience, perseverance, hardiness' "