Luxembourgish ob

← German ob (cognate)

← English if (cognate)

← West Frisian oft (cognate)

← Proto-Germanic *jabai (inherited)

← Middle Low German ef (cognate)

← Proto-Indo-European *e- (derived)

← Proto-Indo-European *ē- (mention)

← Icelandic ef (cognate)

← Icelandic if (mention)

← Dutch of (cognate)