Are you on the lookout for some big dividend yields for your income portfolio?

If you are, then it could be worth checking out the three ASX dividend shares listed below that have been named as buys.

Here's what sort of yields are expecting from these stocks:

APA Group (ASX: APA)

Macquarie is tipping APA Group as an ASX dividend share to buy right now.

It is a leading Australian energy infrastructure business that owns a $26 billion portfolio of gas, electricity, solar and wind assets.

APA Group is on track to lift its dividend for 20 years in a row and Macquarie believes it will get there.

It is forecasting dividend increases to 57 cents per share in FY 2025 and then 57.5 cents per share in FY 2026. Based on the current APA Group share price of $6.92, this equates to 8.2% and 8.3% dividend yields, respectively.

Macquarie has an outperform rating and $8.02 price target on its shares.

Coronado Global Resources Inc (ASX: CRN)

Another high-yield ASX dividend share that is rated as a buy is Coronado Global Resources.

It is the largest pure play met coal producer, aiming to deliver total sales of 15.4Mt to 16Mt into global export markets in 2024.

Bell Potter likes the company due to its belief that a major de-risking event is coming. It notes that from "late CY24, CRN's production profile will de-risk with the introduction of 1.5-2.0Mtpa incremental saleable production from its less weather-affected and lower cost Mammoth Underground Project."

It expects this to support the payment of partially franked dividends of 10 cents per share in FY 2025 and then 8.6 cents per share in FY 2026. Based on its current share price of 73.5 cents, this equates to dividend yields of 13.6% and 11.7%, respectively.

Bell Potter has a buy rating and $1.60 price target on its shares.

Healthco Healthcare and Wellness REIT (ASX: HCW)

A final ASX dividend share that could provide big dividend yields is the Healthco Healthcare and Wellness REIT.

It is a real estate investment trust with a focus on healthcare and wellness assets. This includes hospitals, aged care, childcare, government, life sciences and research, and primary care and wellness properties.

Bell Potter is positive on the company, noting that "with +5% earnings growth expected for FY25, we see value in HCW at current levels with the buyback putting a floor under the share price and HCW continuing to deliver from a property perspective. At a +7% DPS yield and meaningful discount to NTA, HCW screens attractively on a sector-relative basis."

The broker is forecasting dividends per share of 8.4 cents in FY 2025 and then 8.7 cents FY 2026. Based on the current Healthco Healthcare and Wellness REIT unit price of 94.5 cents, this will mean yields of 8.9% and 9.2%, respectively.

Bell Potter currently has a buy rating and $1.50 price target on its shares.