What's in Snape'sname?

[Claudia]

No: HPFGUIDX 148147

I have another question, regarding Snape's first name:

"Severus" strongly reminds of the word "severe", one meaning of it 
being "serious". And "serious" sounds very much like "Sirius" (at least 
to me not-native-English-speaker).  Do you think JKR has made a point 
in giving the two enemies a similar first name?  Or am I completely on 
a wrong track here? (Or did I miss the chewing of this bone, too?)

Claudia