I guess so. The sound [æ] in Jas doesn't exist in Spanish — so Spanish-speakers tend to replace it with either [a] or [e] (actually, many American accents replace it with [e] as well).
I think it would depend if the person was reading
Jasper or hearing someone else pronounce
Jasper in a specific English accent.
Alexandrina, Annabella, Clementine, Charlotte, Emilienne, Florence, Frederica, Katharina, Mary (May), Maud, Penelope, Rosamund, Theodora (Teddy).
Aubrey, Axel, Benedict, Bertrand (Bertie), Cuthbert, Dashiell, Everard, John (Jack) Leopold (Leo), Magnus, Matthias, Maximilian (Max), Wilfred.