Perhaps from הוֹשֵׁעַ (hoshéa, hōšḗaʿ, “Hosea”) with the "addition" of יהוה (“YHWH (Yahweh)”), therefore meaning "Yahweh is salvation". See הוֹשִׁיעַ (hoshía, “to save”). Compare with יְשַׁעְיָהוּ (y'shayáhu, yəšaʿyā́hū).