וַתֵּ֣לֶד בֵּ֔ן וַיִּקְרָ֥א אֶת־שְׁמ֖וֹ גֵּרְשֹׁ֑ם כִּ֣י אָמַ֔ר גֵּ֣ר הָיִ֔יתִי בְּאֶ֖רֶץ נָכְרִיָּֽה׃ (פ)
I urodziła syna; i nazwał imię jego: Gerszom, rzekł bowiem: "Przychodniem byłem w ziemi cudzej."
Chizkuni
ותלד בן, “she gave birth to a son;” there is no mention of her having been pregnant first; this is to tell us that she remained looking like an unmarried virgin, slim throughout her pregnancy. (Pessikta Zutrata)
Rashbam
בארץ נכריה. The meaning of the name Gershom, i.e. a stranger in a distant land.
Sforno
גר הייתי בארץ נכריה. A stranger in a land which is not my birthplace.