Compound of Ida ('industrious,' Germanic) and Lou (from Louise, 'famous warrior').
Idalou is a compound of Ida and Lou, joining a Germanic name associated with industry or labor with a short form from Louise meaning famous warrior. The result is a classic-feeling blend built from two long-lived naming traditions. Idalou feels quaint, sturdy, and a little nostalgic. It has the charm of an old-fashioned compound that sounds both sweet and self-possessed, with a pleasantly grounded quality.