Probably from the same as shaphan; he will hide; Jishpan, an Israelite -- Ishpan.
see HEBREW shaphan
H3473. Yishpan
יִשְׁמָּן proper name, masculine in Benjamin 1 Chronicles 8:22; Ισφαν, A Εσφαν, ᵐ5L Ιεσφαν.
שׁפע (√ of following; Late Hebrew שָׁפַע flow abundantly, be abundant; שְׁפַע ᵑ7, Syriac , overflow, abound).