It is pretty much the same Jessica und Brian-the J is pronounced like a Y
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In American Sign Language (ASL), you can spell out the name "Jessica" using the fingerspelling alphabet. Each letter in the name Jessica would be signed with the corresponding handshapes for J-E-S-S-I-C-A.
alphabet
the alphabet = l'alphabet
Jessica = ג׳סיקה
German uses the same Latin alphabet as English (with one consonant and three accented vowels in addition), so exactly the same as in English will work fine.
Jessica
Jessica = Iesika
Jessika or Jessica
alphabet
The correct spelling is "alphabetical" (in order by spelling).
abc... is the alphabet.