Tara

There is no J in Hebrew. You'll need a Yod. As for the S's, if one's name starts with Sh you should use a Shin. If it's S (or SC or any other S combination), use a Samech. The T would be a Tav, the A an Alef and the R a Resh.

Thank you very much for your help.
Both name s start with Sa, so I guess it will be Samech?
Thank you

Sorry, I forgot, is it for initial C Samech letter?

Depends if it's a hard C or a soft C. For a soft C, go with an S -- Samech. For a hard C I'd use a Kaf.

Thank you

My pleasure!